var rand = Math.floor(Math.random()*4) + 1;
var rand0;
if(rand<10) rand0 = "0"+rand;
function setSheet(){
	var sheet = document.styleSheets[document.styleSheets.length-1];
	//
	if (document.all) {
		sheet.addRule("body","background: url(/topimg/topbg_"+rand0+".jpg) no-repeat 0 0");
		sheet.addRule("#topPanel .caption","display: none");
		sheet.addRule("#topPanel .caption_"+rand, "display: block");
	} else {
		sheet.insertRule("body { background: url(/topimg/topbg_"+rand0+".jpg) no-repeat 0 0; } ", sheet.cssRules.length);
		sheet.insertRule("#topPanel .caption { display: none }", sheet.cssRules.length);
		sheet.insertRule("#topPanel .caption_"+rand+" { display: block; } ", sheet.cssRules.length);
	}
}
if( navigator.userAgent.toLowerCase().indexOf("safari")>-1) {
	window.onload = setSheet;
} else {
	setSheet();
}