js背投代码 - 码农教程

基本代码就以下三行，谁给解释解释，

<script language="JavaScript"> blur(); </script>

以下是全也代码：


 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
 <HTML><HEAD><TITLE>背投广告</TITLE>
 <META http-equiv=Content-Type content="text/html; charset=gb2312">
 <META content="MSHTML 6.00.2800.1458" name=GENERATOR>
 <script type="text/javascript" src="http://image2.sina.com.cn/home/sinaflash.js"></script>
 </HEAD>
 <BODY bgColor=#ffffff leftMargin=0 topMargin=0 marginheight="0">
 <SCRIPT lanaguage="javascript">
 var par = location.search.substr(1);
 var ary = par.split("${}");
 
 if(ary[1]!="swf")
          document.write("<a href='" + ary[0] + "' target = '_blank'><img src='" + ary[2] + "' WIDTH=750 HEIGHT=450   border = 0></a>");
 else         {
 
          document.write("<div id='backPop'>不支持Flash</div>");
          var FlashbackPop = new sinaFlash(ary[2], "ad_backPop", "750", "450", "7", 
 "", false, "High");
          FlashbackPop.addParam("wmode", "opaque");
          FlashbackPop.write("backPop");        
 }
 </SCRIPT>
 
 <script language="JavaScript">
 
 blur();
 self.moveTo(100,50);
 self.resizeTo(760,450);
 self.resizeTo(760,450+(450-self.document.body.clientHeight));
 blur();
 
 </script>
 </BODY></HTML>