if (document.images) {   
         
indepth2on = new Image();   
indepth2on.src = "images/riskfactors/indepth2on.gif";
indepth2off = new Image();   
indepth2off.src = "images/riskfactors/indepth2off.gif"; 

indepth1on = new Image();   
indepth1on.src = "images/riskfactors/indepth1on.gif";
indepth1off = new Image();   
indepth1off.src = "images/riskfactors/indepth1off.gif"; 

arterieson = new Image();   
arterieson.src = "images/riskfactors/arterieson.gif";
arteriesoff = new Image();   
arteriesoff.src = "images/riskfactors/arteriesoff.gif"; 


openon = new Image();   
openon.src = "images/openon.gif";
openoff = new Image();   
openoff.src = "images/openoff.gif"; 


closeon = new Image();   
closeon.src = "images/closeon.gif";
closeoff = new Image();   
closeoff.src = "images/closeoff.gif"; 
}

function switchOn(imageName) {
	if (document.images) {
		document[imageName].src=eval(imageName + "on.src");
  }
}
function switchOff(imageName) {
	if (document.images) {
		document[imageName].src=eval(imageName + "off.src");
  }}