function init(){
	var hoverImages = $$('.hover');
	for(var i=0, n=hoverImages.length; i<n; i++){
		hoverImages[i].onmouseover=function(){
			this.src = this.src.replace("_off","_on");
		};
		hoverImages[i].onmouseout=function(){
			this.src = this.src.replace("_on","_off");
		};
	}
}

function imgSwap(oImg)
{
   var strOver  = "_on"    // image to be used with mouse over
   var strOff = "_off"     // normal image
   var strImg = oImg.src
   if (strImg.indexOf(strOver) != -1) 
      oImg.src = strImg.replace(strOver,strOff)
   else
      oImg.src = strImg.replace(strOff,strOver)
}