JavaScript error

I have an old web site with the following script in aspx page. When I load the Solution into Visual Studio, it complains that the syntax function window.onload() is an error. How do I fix it and hat has changed?

function window.onload() { 
			    var role = new String("<% =NMUser.Access%>");
			    var login = new String("<%=NMUser.LoggedFor %>");
			    document.login = login;
			    document.role = role;
				var tblMain = document.getElementById("tblMain");
				tblMain.greenBarIt = showGreenBar;
				tblMain.clear = clearTable;
				tblMain.greenBarIt();//showGreenBar();
				tblMain.onmouseout=tblMain_onmouseOut;
				tblMain.AddMailTo= addMailTo;
				tblMain.AddMailTo();
				document.Form1.txtPwd.onkeydown = txtPwd_onkeydown;
				var cboPage = document.getElementById("cboPage");
				cboPage.onchange = cboPage_onchange;
				var txtLookup = document.getElementById("txtLookup");
				txtLookup.tbl = tblMain;
				txtLookup.onkeyup = txtLookupKeyUp;
				txtLookup.onkeydown = txtLookupKeyDown;
				var btnSearch = document.getElementById("btnSearch");
				var anc_createNewMatter = document.getElementById("anc_createNewMatter");
				anc_createNewMatter.onclick = anc_createNewMatter_Click;
				btnSearch.txt = txtLookup;
				btnSearch.onclick = btnSearchClikck;
				document.forms[0].onsubmit = form_onsubmit;
            }

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josephdtsAsked:
Who is Participating?
 
leakim971Connect With a Mentor PluritechnicianCommented:
replace :
function window.onload() {
by :
window.onload = function() {

or better use :
if(window.addEventListener){
	window.addEventListener("load", f);
}
else {
	window.attachEvent("onload", f);
}
var f = function() {
	var role = new String("<% =NMUser.Access%>");
	var login = new String("<%=NMUser.LoggedFor %>");
	document.login = login;
	document.role = role;
	var tblMain = document.getElementById("tblMain");
	tblMain.greenBarIt = showGreenBar;
	tblMain.clear = clearTable;
	tblMain.greenBarIt();//showGreenBar();
	tblMain.onmouseout=tblMain_onmouseOut;
	tblMain.AddMailTo= addMailTo;
	tblMain.AddMailTo();
	document.Form1.txtPwd.onkeydown = txtPwd_onkeydown;
	var cboPage = document.getElementById("cboPage");
	cboPage.onchange = cboPage_onchange;
	var txtLookup = document.getElementById("txtLookup");
	txtLookup.tbl = tblMain;
	txtLookup.onkeyup = txtLookupKeyUp;
	txtLookup.onkeydown = txtLookupKeyDown;
	var btnSearch = document.getElementById("btnSearch");
	var anc_createNewMatter = document.getElementById("anc_createNewMatter");
	anc_createNewMatter.onclick = anc_createNewMatter_Click;
	btnSearch.txt = txtLookup;
	btnSearch.onclick = btnSearchClikck;
	document.forms[0].onsubmit = form_onsubmit;
}

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