//set stage center;
var content=jQuery("#wraper");
var setCenter=function(animate){//parameter:1:animate,0:css positoin;
	var margintop=Math.ceil((jQuery(window).height()-590)/2);
	margintop=margintop>0 ? margintop : 0;
	var marginleft=Math.ceil((jQuery(window).width()-977)/2);
	marginleft=marginleft>0 ? marginleft: 0;
	if(animate){
		content.animate({
			top:margintop,
			left:marginleft
		},{duration:300,queue:false});
	}else{
		content.css({
			top:margintop,
			left:marginleft
		});
	}
}
setCenter(0);