function roll(img_name1, img_src1){
	document[img_name1].src = img_src1;
}
function launch( url, name, w, h ) {
	yOffset = 23;
	xOffset = 23;
    pop = window.open( url,name,"width="+w+",height="+h+",status=1,resizable=0,menubar=0,toolbar=0,directories=0,location=0,scrollbars=0,top="+yOffset+",left="+xOffset );
	pop.focus();
}
function redirect(){ document.location='/main.php'; }