//根据指定的URL打开模式窗口
    function showUrlByModalDialog(url){
    	paras="dialogHeight:500px;dialogWidth:700px;scrollbars:yes;resizable:yes;status:no;";
	   	window.showModalDialog(url,window,paras);
    }
     //根据指定的URL打开模式窗口
    function showUrlByModalDialog(url,height){
    	
    	paras="dialogHeight:"+ height + "px;dialogWidth:700px;scrollbars:yes;resizable:yes;status:no;";
	   	window.showModalDialog(url,window,paras);
    }
    
     //根据指定的URL打开模式窗口
    function showUrlByModalDialog(url,height,width){
    	paras="dialogHeight:"+ height + "px;dialogWidth:"+width+"px;scrollbars:yes;resizable:yes;status:no;";
	   	window.showModalDialog(url,window,paras);
    }