var preloadFlag = false;
function preloadImages() {
if (document.images)  {
	// load images
	

	dramalessonoff=new Image();
	dramalessonoff.src = '../../bnb/butosec1.gif';			
	dramalessonon=new Image();
	dramalessonon.src = '../../bnb/butnsec1.gif';
	
	dramastudiooff=new Image();
	dramastudiooff.src = '../../bnb/butosec2.gif';			
	dramastudioon=new Image();
	dramastudioon.src = '../../bnb/butnsec2.gif';
	
	shakespeareoff=new Image();
	shakespeareoff.src = '../../bnb/butosec3.gif';			
	shakespeareon=new Image();
	shakespeareon.src = '../../bnb/butnsec3.gif';
	
	specialneedsoff=new Image();
	specialneedsoff.src = '../../bnb/butosec4.gif';			
	specialneedson=new Image();
	specialneedson.src = '../../bnb/butnsec4.gif';
	
	
	preloadFlag = true;
	window.focus();
		}
}


// function that does MouseOvers and MouseOut calls


function buttonChange(imName,imSource) {
		if (document.images && (preloadFlag == true)) {
		document[imName].src=eval(imSource + ".src");
	}
}