function handleOnChange_vehicle_type(doWhatCode, callingObject){
				
		if (doWhatCode.value == 0){
			document.frmStockCentral.model.value = "";		
		}
		
		document.frmStockCentral.doWhat.value = doWhatCode;
		document.frmStockCentral.submit();
	
	}
	
	
	function resetform(){
		
		for (i=0; i<document.frmStockCentral.elements.length; i++){
			document.frmStockCentral.elements[i].value="";
		}

		document.frmStockCentral.submit();
		
	}
	
	
	function searchStock(doWhatCode){
			
		document.frmStockCentral.doWhat.value = doWhatCode;
		document.frmStockCentral.action = "stock.php";
		document.frmStockCentral.submit();		
		
	}