頁面加載等待遮罩

/**  
*  頁面加載等待頁面
*/  
var height = window.screen.height-180;   
var width = window.screen.width;   
 var leftW = 300;   
 if(width>1200){   
    leftW = 500;   
 }else if(width>1000){   
    leftW = 350;   
 }else {   
    leftW = 100;   
 }   
    
 var _html = "<div id='loading' style=\"position:absolute;left:0;width:100%;height:" + height 
 + "px;top:0;background:#E0ECFF;opacity:0.8;filter:alpha(opacity=80);\"><div style=\"position:absolute;  cursor1:wait;left:"+leftW+"px;top:200px;width:auto;height:16px;padding:12px 5px 10px 30px;background:#fff url('http://localhost:8888/ptp/css/images/pagination_loading.gif') no-repeat scroll 5px 14px;border:2px solid #ccc;color:#000;\">正在加載，請等待...</div></div>";   
    
 window.onload = function(){   
    
 }   
  
 function startMask(){
	$("#ss").html(_html);
 }
 
 function endMask(){
	var _mask = document.getElementById('loading');
    if(_mask!=null){
    	_mask.parentNode.removeChild(_mask);
    }   
 }