function doSubmit(){
	if ( validate1()) {
		form_worth.submit(true);
	}	
}

function validate1()	{

  	if (document.form_worth.txtMake.value == "") {
    	alert("Please enter make of your car.");
   		document.form_worth.txtMake.focus();
    	return false;
  	}
	else if (document.form_worth.txtModel.value == "") {
    	alert("Please enter model of your car.");
   		document.form_worth.txtModel.focus();
    	return false;
  	}
	else if (document.form_worth.txtRegNum.value == "") {
    	alert("Please enter registration number of your car.");
   		document.form_worth.txtRegNum.focus();
    	return false;
  	}
	else{
		return true;
	}
}