if (document.layers){
  //Netscape 4 specific code
  pre = 'document.';
  post = '';
}

if (document.getElementById){
  //Netscape 6 specific code
  pre = 'document.getElementById("';
  post = '").style';
}

if (document.all){
  //IE4+ specific code
  pre = 'document.all.';
  post = '.style';
}

function showLayer(lyr){
  eval(pre +  lyr + post).display= 'block'
}

function hideLayer(lyr){
  eval(pre +  lyr + post).display= 'none'
}

function hideAllSubLayer(){
	hideLayer('education_undergraduate_sub')
  hideLayer('education_graduate_sub')
	hideLayer('education_outreach_sub')
	document.education_undergraduate_arrow.src='images/arrow_close.gif'
	document.education_graduate_arrow.src='images/arrow_close.gif'
	document.education_outreach_arrow.src='images/arrow_close.gif'
}

function showHideSubLayer(sublayer){
	if (sublayer == "education_undergraduate"){
		if (document.education_undergraduate_arrow.src.indexOf('close')>1){
			showLayer("education_undergraduate_sub")
			document.education_undergraduate_arrow.src = "images/arrow_open.gif"
		}
		else{
			hideLayer("education_undergraduate_sub")
			document.education_undergraduate_arrow.src = "images/arrow_close.gif"
		}
	}
	
	else if (sublayer == "education_graduate"){
		if (document.education_graduate_arrow.src.indexOf('close')>1){
			showLayer("education_graduate_sub")
			document.education_graduate_arrow.src = "images/arrow_open.gif"
		}
		else{
			hideLayer("education_graduate_sub")
			document.education_graduate_arrow.src = "images/arrow_close.gif"
		}
	}

	else if (sublayer == "education_outreach"){
		if (document.education_outreach_arrow.src.indexOf('close')>1){
			showLayer("education_outreach_sub")
			document.education_outreach_arrow.src = "images/arrow_open.gif"
		}
		else{
			hideLayer("education_outreach_sub")
			document.education_outreach_arrow.src = "images/arrow_close.gif"
		}
	}

	else if (sublayer == "research_Laboratory"){
		if (document.research_Laboratory_arrow.src.indexOf('close')>1){
			showLayer("research_Laboratory_sub")
			document.research_Laboratory_arrow.src = "images/arrow_open.gif"
		}
		else{
			hideLayer("research_Laboratory_sub")
			document.research_Laboratory_arrow.src = "images/arrow_close.gif"
		}
	}

	else if (sublayer == "research_Collaborators"){
		if (document.research_Collaborators_arrow.src.indexOf('close')>1){
			showLayer("research_Collaborators_sub")
			document.research_Collaborators_arrow.src = "images/arrow_open.gif"
		}
		else{
			hideLayer("research_Collaborators_sub")
			document.research_Collaborators_arrow.src = "images/arrow_close.gif"
		}
	}

	else if (sublayer == "research_Other"){
		if (document.research_Other_arrow.src.indexOf('close')>1){
			showLayer("research_Other_sub")
			document.research_Other_arrow.src = "images/arrow_open.gif"
		}
		else{
			hideLayer("research_Other_sub")
			document.research_Other_arrow.src = "images/arrow_close.gif"
		}
	}

	else if (sublayer == "community_Faculty"){
		if (document.community_Faculty_arrow.src.indexOf('close')>1){
			showLayer("community_Faculty_sub")
			document.community_Faculty_arrow.src = "images/arrow_open.gif"
		}
		else{
			hideLayer("community_Faculty_sub")
			document.community_Faculty_arrow.src = "images/arrow_close.gif"
		}
	}

	else if (sublayer == "community_Students"){
		if (document.community_Students_arrow.src.indexOf('close')>1){
			showLayer("community_Students_sub")
			document.community_Students_arrow.src = "images/arrow_open.gif"
		}
		else{
			hideLayer("community_Students_sub")
			document.community_Students_arrow.src = "images/arrow_close.gif"
		}
	}

	else if (sublayer == "community_UCR"){
		if (document.community_UCR_arrow.src.indexOf('close')>1){
			showLayer("community_UCR_sub")
			document.community_UCR_arrow.src = "images/arrow_open.gif"
		}
		else{
			hideLayer("community_UCR_sub")
			document.community_UCR_arrow.src = "images/arrow_close.gif"
		}
	}

	else if (sublayer == "community_Collaborators"){
		if (document.community_Collaborators_arrow.src.indexOf('close')>1){
			showLayer("community_Collaborators_sub")
			document.community_Collaborators_arrow.src = "images/arrow_open.gif"
		}
		else{
			hideLayer("community_Collaborators_sub")
			document.community_Collaborators_arrow.src = "images/arrow_close.gif"
		}
	}
}

function hideEducationSideSubLayer(){
	hideLayer('side_menu_education')
  hideLayer('side_menu_community')
	hideLayer('side_menu_research')
	hideLayer('side_menu_events')
	hideLayer('side_menu_other')
	hideLayer('side_menu_courses')
	document.sidemenu_education_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_community_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_research_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_events_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_other_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_courses_arrow.src='images/arrow_sidemenu_close.gif'
}

function showEducationSideSubLayer(lyr){
  eval(pre +  lyr + post).display= 'block'
	document.sidemenu_education_arrow.src='images/arrow_sidemenu_open.gif'
}

function hideResearchSideSubLayer(){
	hideLayer('side_menu_education')
  hideLayer('side_menu_community')
	hideLayer('side_menu_research')
	hideLayer('side_menu_events')
	hideLayer('side_menu_other')
	hideLayer('side_menu_courses')
	document.sidemenu_education_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_community_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_research_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_events_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_other_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_courses_arrow.src='images/arrow_sidemenu_close.gif'
}

function showResearchSideSubLayer(lyr){
  eval(pre +  lyr + post).display= 'block'
	document.sidemenu_research_arrow.src='images/arrow_sidemenu_open.gif'
}

function hideCommunitySideSubLayer(){
	hideLayer('side_menu_education')
  hideLayer('side_menu_community')
	hideLayer('side_menu_research')
	hideLayer('side_menu_events')
	hideLayer('side_menu_other')
	hideLayer('side_menu_courses')
	document.sidemenu_education_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_community_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_research_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_events_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_other_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_courses_arrow.src='images/arrow_sidemenu_close.gif'
}

function showCommunitySideSubLayer(lyr){
  eval(pre +  lyr + post).display= 'block'
	document.sidemenu_community_arrow.src='images/arrow_sidemenu_open.gif'
}

function hideEventsSideSubLayer(){
	hideLayer('side_menu_education')
  hideLayer('side_menu_community')
	hideLayer('side_menu_research')
	hideLayer('side_menu_events')
	hideLayer('side_menu_other')
	hideLayer('side_menu_courses')
	document.sidemenu_education_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_community_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_research_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_events_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_other_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_courses_arrow.src='images/arrow_sidemenu_close.gif'
}

function showEventsSideSubLayer(lyr){
  eval(pre +  lyr + post).display= 'block'
	document.sidemenu_events_arrow.src='images/arrow_sidemenu_open.gif'
}

function hideOtherSideSubLayer(){
	hideLayer('side_menu_education')
  hideLayer('side_menu_community')
	hideLayer('side_menu_research')
	hideLayer('side_menu_events')
	hideLayer('side_menu_other')
	hideLayer('side_menu_courses')
	document.sidemenu_education_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_community_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_research_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_events_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_other_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_courses_arrow.src='images/arrow_sidemenu_close.gif'
}

function showOtherSideSubLayer(lyr){
  eval(pre +  lyr + post).display= 'block'
	document.sidemenu_other_arrow.src='images/arrow_sidemenu_open.gif'
}

function hideCoursesSideSubLayer(){
	hideLayer('side_menu_education')
  hideLayer('side_menu_community')
	hideLayer('side_menu_research')
	hideLayer('side_menu_events')
	hideLayer('side_menu_other')
	hideLayer('side_menu_courses')
	document.sidemenu_education_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_community_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_research_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_events_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_other_arrow.src='images/arrow_sidemenu_close.gif'
	document.sidemenu_courses_arrow.src='images/arrow_sidemenu_close.gif'
}

function showCoursesSideSubLayer(lyr){
  eval(pre +  lyr + post).display= 'block'
	document.sidemenu_courses_arrow.src='images/arrow_sidemenu_open.gif'
}