function validate() {

    var noData = true;
    
    for (var i = 0; i<document.multiProductForm.elements.length; i++) {
     if (document.multiProductForm.elements[i].value != '') {
        noData=false;
     }
    }
    
    if (noData ==true) {
        alert('Please enter a catalogue number to proceed...\n');
    }
    else {
        // addCatNoCookie();   
        document.multiProductForm.submit();
    }
}