var myimages=new Array()
function preloadimages(){
for (i=0;i<preloadimages.arguments.length;i++){
myimages[i]=new Image()
myimages[i].src=preloadimages.arguments[i]
}
}

preloadimages("images/mainpic1.jpg","images/mainpic2.jpg","images/mainpic3.jpg","images/mainpic4.jpg","images/mainpic5.jpg","images/mainpic6.jpg","images/mainpic7.jpg","images/twitter1a.gif","images/facebook1a.gif")