function changecat ( main )
{
var form = document.forms[0];
var sub = form.cat.options[form.cat.selectedIndex].value;
var url = window.location.href;
var opendocument = url.toLowerCase().indexOf ( "opendocument" );
var openview = url.toLowerCase().indexOf ( "openview" );
var readform = url.toLowerCase().indexOf ( "readform" );
var searchview = url.toLowerCase().indexOf ( "searchview" );
var search = "" ;

if (openview > -1) { search = url.substring(0,openview -1) }
if (searchview > -1) { search = url.substring(0,searchview -1) }
if (opendocument > -1) { search = url.substring(0,opendocument) ; search = search.substring(0,search.lastIndexOf ( "/" )) }
if (readform > -1) { search = url.substring(0,readform) }

var view = search.substring ( search.lastIndexOf ( "/" )+1 , search.length );
search = search.substring ( 0 , search.lastIndexOf ( "/" )+1 );

if ( sub != "") { sub = "~"+sub }
url = search + view + "?openview&restricttocategory="+main+sub;
url = url + "&start=1&count=10";

window.location.href = url;
}