Javascript Parameters Not Reaching The Servlet While Using IE7

On IE7 I'm using a script:

function saveValues()
{
var validateOK=true;
if (typeof validate !='undefined')
validateOK = validate(document.EditForm);

if (validateOK==true) {
theAction = document.EditForm.action;
if ( theAction.indexOf('?') == -1 ) {
if ( theAction.indexOf('#') == -1 ) {
document.EditForm.action = theAction + "?__haction=apply"
} else {
posit = theAction.indexOf('#')
document.EditForm.action = theAction.substring(0,posit) +
"?__haction=apply" + theAction.substring(posit,theAction.length)
}
} else {
posit = theAction.indexOf('?')
document.EditForm.action = theAction.substring(0,posit+1) +
"__haction=apply&" + theAction.substring(posit+1,theAction.length)
}
document.EditForm.submit();
}
}

but the http parameters are not reaching the servlet.But this works
absolutely fine on IE6

what could be the possibilites for this script faliure.