function imagerollover(){var allimages=document.getElementsByTagName("img")
var preloadimages=[]
for(var i=0;i<allimages.length;i++){if(allimages[i].getAttribute("data-over")){preloadimages.push(new Image())
preloadimages[preloadimages.length-1].src=allimages[i].getAttribute("data-over")
allimages[i].onmouseover=function(){this.src=this.getAttribute("data-over")}
allimages[i].onmouseout=function(){this.src=this.getAttribute("data-out")}}}}