function validate_form(){
    if(document.search.searchbox.value == ""){
        alert ( "Please enter your search text!" );
        return false;
    }
    return true;
}
function validate1_form(){
    if(document.mainform.datevalue.value == ""){
        alert ( "Please select a date!" );
        return false;
    }
    return true;
}
function validate2_form(){
    if(document.mainform1.datevalue1.value == ""){
        alert ( "Please select a date!" );
        return false;
    }
    return true;
}