var offSrc="";
var headImg;
var headOffSrc;

function roll(daImg,daSrc) {
	offSrc=daImg.src;
	daImg.src=daSrc;
}

function rollOff(daImg) {
	daImg.src=offSrc;
}

function rollCol(daImg,daSrc,daHeadImg,newHeadSrc) {
	offSrc=daImg.src;
	headImg = document.images[daHeadImg];
	headOffSrc = headImg.src;
	daImg.src = daSrc;
	headImg.src=newHeadSrc;
}

function rollColOff(daImg) {
	daImg.src=offSrc;
	headImg.src=headOffSrc;
}