监视iframe的onload事件
我在一个页面中有一个iframe,其ID为I1,请问我如何在父窗口中监视iframe的onload事件,即:当我用脚本改变I1的location.href属性,页面重新载入后怎样才能又一次触发父窗口onload脚本。 
 谢谢
------解决方案-------------------- <iframe src= " " id= "T1 ">  </iframe>  
  <script type= "text/javascript ">  
 var c = document.getElementById( "T1 "); 
 c.onreadystatechange = function(){ 
 	alert(this.readyState); 
 } 
  </script>  
  <input type= "button " value= "sohu " onclick= "c.src= 'http://www.sohu.com ' "/>  
  <input type= "button " value= "163 " onclick= "c.src= 'http://www.163.com ' "/>
------解决方案--------------------支持楼上!:)
------解决方案--------------------在iframe标签里加个onload 
  <html>  
  <head>  
  <meta http-equiv= "Content-Type " content= "text/html; charset=GBK ">  
  <title> iframe </title>  
  <script type= "text/javascript ">  
 	function loadWin(){alert( "AAA ");} 
 window.onload=loadWin; 
  </script>  
  </head>  
  <body style= "margin:0 0 0 0; ">  
  <iframe src= " " id= "f1 " style= "margin:0 0 0 0; " onload= "loadWin() ">  </iframe>  
  </body>   
  </html>  
------解决方案--------------------支持楼上!:)   
 IFRAME有onload事件