//获取可见区域高度
function pageHeight(){
		if($.browser.msie){
				return document.compatMode ==	"CSS1Compat"?	document.documentElement.clientHeight	:	document.body.clientHeight;
		}else{
				return self.innerHeight;
		}
};
//获取可见区域宽度
function pageWidth(){
		if($.browser.msie){
				return document.compatMode ==	"CSS1Compat"?	document.documentElement.clientWidth :document.body.clientWidth;
		}else{
				return self.innerWidth;
		}
};
//抛出覆盖全屏div的jQuery对象，点击取消显示调用示例	 overall("#000").click(clearOver);
function overall(arg){
		var	strbgColor = arg ? arg : "#fff";
		var	strScrollTop = document.documentElement.scrollTop;
		var	strScrollLeft	=	document.documentElement.scrollLeft;
		$("html").css("overflow","hidden");
		$("body").css("overflow","hidden");
		$("select").css("display","none");
		$("body").append("<div id=StormUI_overall></div>");
		$("#StormUI_overall").css({
				opacity:"0",
				"background-color":strbgColor,
				"width":pageWidth()+"px",
				"height":pageHeight()+"px",
				"position":"absolute",
				"top":strScrollTop+"px",
				"left":strScrollLeft+"px",
				"z-index":"1000"
		}).animate({opacity:"0.4"},300);
		return $("#StormUI_overall");
};
//撤销模态窗口
function clearOver(){
		if($("#StormUI_overall")){
				$("#StormUI_overall").fadeOut(300,function(){
						$("html").css("overflow","");
						$("body").css("overflow","");
						$("select").css("display","");
						$(this).unbind().remove();
				});
		}
}