打开与图片大小相等的窗体

<script type="text/javascript"><!--
   function openWithSelfMain(url,name,width,height,top,left,noscrollbars){
     width2=(width<=screen.width)?width:(screen.width*3/4);
     height2=(height<=screen.height)?height:(screen.height*3/4);
     var options = "width=" + width2 + ",height=" + height2;
     if(top!="") options += ",top="+ top;
     if(left!="") options += ",left="+ left;
     options += "toolbar=no,location=no,directories=no,status=no,menubar=no,resizable=yes,copyhistory=no";
     if(noscrollbars == null || noscrollbars == "" || noscrollbars == "0" || width>screen.width || height>screen.height){
     options += ",scrollbars=yes";
     }else{
     options+= ",scrollbars=no";
     }
     //alert(width+">>"+height);
     //return false;
     new_window = window.open(url, name, options);
     window.self.name = "main";
     new_window.focus();
   }
//--></script>