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set websplitter's width and height when the page is load
posted

when the page was loading, how can I set websplitter's width and height.  Now I wrote the below code:

js code:

function SetSize()
 {
     var w=document.documentElement.offsetWidth;
     var h=document.documentElement.offsetHeight;
     var splitter = $find("WebSplitterTree");
     splitter._element.style.width = (w-4)+"px";
     splitter._element.style.height = (h-87)+"px";
}

page code:

<body onload="SetSize();">.......</body>

But program can not find the websplitter.  I output the splitter by alert, the result is null.  Why I can't set websplitter's size when in body's onload event?