document.getElementById('searchBar').firstChild.nextSibling.nextSibling.setAttribute('href','custompage.aspx?custompage=SiteMap');

function searchTemplatesButton()
{
//var searchvalue = document.Form1.searchbarinput.value;
var searchvalue = document.getElementById('searchbarinput').value;
window.location.href = "ProdSearch.aspx?Search="+escape(searchvalue.replace("&",""))+'&type=Subject';
}
var sbtn = document.getElementById('B1').onclick = searchTemplatesButton;