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)
}
var projectimages = new Array();
function preloadImages(){
	for (x=0; x<preloadImages.arguments.length; x++){
		projectimages[x] = new Image();
		projectimages[x].src = preloadImages.arguments[x];
	}
}