function doInit(){
				 oForm 											 = document.order_form;
				 oForm.quantity.value 			 = "1";
         oForm.result.disabled       = true;
} // end function

function getCount(){
		oForm = document.order_form;
		var f = oForm.elements['model'];
    for(j=0;j<f.length;j++){
      if(f[j].checked) {
       var model = j;
      }
    }
    
	var i 				= oForm.year.selectedIndex;		 
  var quantity 	= oForm.quantity.value;
  var res = prices[i][model] * quantity;
	
if((i == 0) && oForm.metal.checked && (res != 0)){
    res = res + 400;
}else{
  if(oForm.metal.checked && (res != 0)) {
    res = res + 400;
	} 
}

oForm.result.value = res;

if(oForm.result.value == 0){
            oForm.result.value = "???";
}

} // end function

function CheckRadio(){
    for(j=0;j<=8;j++){
      if(document.order_form.elements[j].checked) {
				 return true;
      }
    }
		return false;
}

function CheckQuantity(){
    var myRegExp = /^[1-9][0-9]{0,}$/
		if(myRegExp.test(document.order_form.quantity.value)){
		   return true;
		}
		return false;
}