function show_jquery_popup(div_id,bg_div_id, popup_flag){
	if(popup_flag==0){
		//request data for centering
		var windowWidth = document.documentElement.clientWidth;
		var windowHeight = document.documentElement.clientHeight;
		var popupHeight = $("#"+div_id).height();
		var popupWidth = $("#"+div_id).width();
		//centering
		$("#"+div_id).css({
			"top": windowHeight/2-popupHeight/2,
			"left": windowWidth/2-popupWidth/2
		});
		//only need force for IE6
		$("#"+bg_div_id).css({
			"height": windowHeight
		});
		$("#"+bg_div_id).fadeIn("slow");
		$("#"+div_id).fadeIn("slow");
		$("#"+bg_div_id).click(function(){
			hide_jquery_popup(div_id,bg_div_id,popup_flag);
		});
		$(document).keypress(function(e){
			if(e.keyCode==27 && popup_flag==1){
				hide_jquery_popup(div_id,bg_div_id,popup_flag);
			}
		});
		popup_flag=1;
	}
}

function hide_jquery_popup(div_id,bg_div_id, popup_flag){
	if(popup_flag==1){
		$("#"+div_id).fadeOut("slow");
		$("#"+bg_div_id).fadeOut("slow");
		popup_flag=0;
	}
	
}