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('picture_library/nintendo_ds.png','picture_library/ps2.png','picture_library/ps3.png','picture_library/psp.png','picture_library/xbox360.png','picture_library/wii.png','picture_library/windows.png');

function cambimg(name, imgurl) { 
	document.images[name].src = imgurl;
}