function setup( name) {
	$("#" + name ).hide();
	$("#" + name + "collapse").hide();
	$("#" + name + "collapse").click( function() {switchMenu(name)} )
	$("#" + name + "expand").click( function() {switchMenu(name)} )
}

function switchMenu(obj) {
	toggleField( obj );
	toggleField( obj + "expand");
	toggleField( obj + "collapse");
}

function toggleField(obj) {
	var el = document.getElementById(obj);
	if ( el.style.display != "none" ) {
		el.style.display = 'none';
	}
	else {
		el.style.display = '';
	}
}

<!--------------------------------------------------------------------->

var 
business_processes_image = new Image();
information_image = new Image();
domain_expertise_image = new Image();
applications_image = new Image();
technology_image = new Image();
implement_image = new Image();
management_image = new Image();
governance_image = new Image();
risk_image = new Image();
compliance_image = new Image();
client_vision_image = new Image();
client_roi_image = new Image();

function downloadImages(){
	business_processes_image.src="images/mission/iti-mission-business_processes.png";
	information_image.src="images/mission/iti-mission-information.png";
	domain_expertise_image.src="images/mission/iti-mission-domain_expertise.png";
	applications_image.src="images/mission/iti-mission-applications.png";
	technology_image.src="images/mission/iti-mission-technology.png";
	implement_image.src="images/mission/iti-mission-implement.png";
	management_image.src="images/mission/iti-mission-management.png";
	governance_image.src="images/mission/iti-mission-governance.png";
	risk_image.src="images/mission/iti-mission-risk.png";
	compliance_image.src="images/mission/iti-mission-compliance.png";
	client_vision_image.src="images/mission/iti-mission-client_vision.png";
	client_roi_image.src="images/mission/iti-mission-client_roi.png";
}

var oldSlideDivName="eva_0";
var slideCount=1;
var group = "eva";


function displaySlide( grp) {
	group = grp;
	slideCount=-1;
	document.getElementById("home-slides-traverse-right").style.display = 'none';
	document.getElementById('home-slides-traverse-left').style.display = 'none';
	document.getElementById("mission").src = "images/mission/iti-mission-" + grp + ".png";
	displayNextSlide();
}

function displayNextSlide() {
	if( pause_slides == 1)
		return;
	slideCount++;
	var newSlideDivName = group + '_' + slideCount;
	if( document.getElementById(newSlideDivName)) {
		if( document.getElementById(oldSlideDivName)) {
			document.getElementById(oldSlideDivName).style.display = 'none';
		}
		document.getElementById(newSlideDivName).style.display = 'block';	
		oldSlideDivName = newSlideDivName;
		displayPrevNextArrows();
	}else {
		slideCount--;
	}

	return;	
}

function displayPrevNextArrows() {
		document.getElementById('home-slides-traverse-left').style.display = 'none';
		document.getElementById('home-slides-traverse-right').style.display = 'none';
		if( document.getElementById(group + '_' + (slideCount+1))) {			
			document.getElementById("home-slides-traverse-right").style.display = 'block';
		}
		if( document.getElementById(group + '_' + (slideCount-1))) {		
			document.getElementById("home-slides-traverse-left").style.display = 'block';
		}	
}

function displayPrevSlide() {
	slideCount--;
	var newSlideDivName = group + '_' + slideCount;
	if( document.getElementById(newSlideDivName)) {
		if( document.getElementById(oldSlideDivName)) {
			document.getElementById(oldSlideDivName).style.display = 'none';
		}
		document.getElementById(newSlideDivName).style.display = 'block';	
		oldSlideDivName = newSlideDivName;
		displayPrevNextArrows();
	}else {
		slideCount++;
	}	
	return;
}
<!--------------------------------------------------------------------->