function swap()
{
	var totalImages=10;
	imgEnding = new Array("images/sitebig/0.gif", "images/sitebig/1.gif", "images/sitebig/2.gif", "images/sitebig/3.gif", "images/sitebig/4.gif", "images/sitebig/5.gif", "images/sitebig/6.gif", "images/sitebig/7.gif", "images/sitebig/8.gif", "images/sitebig/9.gif");
	x=(Math.floor(Math.random()*totalImages));
	randomimage=(imgEnding[x]);
	document.getElementById("main").style.backgroundImage = "url("+ randomimage +")";
}