function setpage(leftimage, rightimage, titlelayer, footerimage, navlayer)
{
	//alert(leftimage);
	if(leftimage!=""){
		document.getElementById("LP").style.backgroundImage="url("+leftimage+")";
	}
	if(rightimage!=""){
		document.getElementById("RP").style.backgroundImage="url("+rightimage+")";
	}
	if(titlelayer!=""){
		document.getElementById(titlelayer).style.display="block";
	}
	if(footerimage!=""){
		document.images["footerimg"].src=footerimage;
	}
	if(navlayer!=""){
		document.getElementById(navlayer).style.display="block";
	}
}

var previousans=""
function showanswer(cid){
	if (previousans!="")
			document.getElementById(previousans).style.display="none";
	document.getElementById(cid).style.display="block";
	previousans=cid;
}

function rollOn(theImg){
//alert('images/button_'+theImg+'_f2.png');
document[theImg].src="./images/button_"+theImg+"_f2.png";
}
function rollOff(theImg){
document[theImg].src="./images/button_"+theImg+".png";
}