[coder13aa]

why this code work fine

function OnChangeAction()
{
var e = document.getElementById('<%=ddlSelectItems.ClientI D %>');
var selVal = e.options[e.selectedIndex].value;
SelectAll(selVal);
}

and this code not work

function OnChangeAction()
{
var selVal = $("id$=ddlSelectItems option:selected").text();
SelectAll(selVal);
}


<aspropDownList ID="ddlSelectItems" runat="server"
onchange="OnChangeAction();">
</aspropDownList>

SelectAll function work fine.