function ShowWindow(elem){
	var wW = $(window).width();
	var wH = $(window).height();
	var eW = $('#'+elem).width();
	var eH = $('#'+elem).height();
	var xScroll, yScroll;
	var wTop, wLeft;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
		xScroll = self.pageXOffset;
	} else if (document.documentElement && document.documentElement.scrollTop) {
		yScroll = document.documentElement.scrollTop;
		xScroll = document.documentElement.scrollLeft;
	} else if (document.body) {
		yScroll = document.body.scrollTop;
		xScroll = document.body.scrollLeft;	
	}
	
	wLeft = Math.round((wW-eW)/2 + xScroll);
	wTop = Math.round((wH-eH)/2 + yScroll);
	$('#'+elem).css("top",wTop);
	$('#'+elem).css("left",wLeft);
	$('#'+elem).show(500);
}