How to refer a Div to this Java Script from master page to the Web Form

<script type="text/javascript">
    var xPos, yPos;
    var prm = Sys.WebForms.PageRequestManager.getInstance();
    prm.add_beginRequest(BeginRequestHandler);
    prm.add_endRequest(EndRequestHandler);
    function BeginRequestHandler(sender, args) {
        xPos = $get('scrollDiv').scrollLeft;
        yPos = $get('scrollDiv').scrollTop;
    }
    function EndRequestHandler(sender, args) {
        $get('scrollDiv').scrollLeft = xPos;
        $get('scrollDiv').scrollTop = yPos;
    }
 
How to refer a div to this Javascript.. This script place in MASTER PAGE AND I WANT THIS TO INVOKE IN WEB FOR HOW CAN I REFER A DIV TO THIS SCRIPT.

Link of this source :<a href="http://weblogs.asp.net/andrewfrederick/maintain-scroll-position-after-asynchronous-postback">http://weblogs.asp.net/andrewfrederick/maintain-scroll-position-after-asynchronous-postback</a>[<a href="http://weblogs.asp.net/andrewfrederick/maintain-scroll-position-after-asynchronous-postback" target="_blank" title="New Window">^</a>]