window.addEvent('domready',function(){
	    $('addtocart').addEvent('click',function(event){
	        // variable setup
	        var errors='';

            // do tests
            if($('CompanyABN_field') && $('CompanyABN_field').value==''){
              errors+='Please enter your ABN!\n';
            }
            if($('BSBNumber_field') && $('BSBNumber_field').value==''){
              errors+='Please enter your BSB number!\n';
            }
            if($('BankAccountNo._field') && $('BankAccountNo._field').value==''){
              errors+='Please enter your bank account number!\n';
            }
            if($('StartingChequeNumber_field') && $('StartingChequeNumber_field').value==''){
              errors+='Please enter your starting cheque number!\n';
            }

            // check errors
            if(errors!=''){
              event.stop();
              alert(errors);
            }
	    });
 	});