String.prototype.checker = function(word,lenWord){
var return_alert="";
if (word.length == 0 || word.length > lenWord) {
          return_alert='כמות לא חוקית'; 
} else { 
   for (n=0; n < word.length; n++) {
      if (word.charAt(n)<"0" || word.charAt(n)>"9") {
          return_alert='כמות לא חוקית'; 
          break;
      }    
   }
}
if (return_alert == "")
{
	var num = eval(word)
	if (num < 0) //negative quantity
          return_alert='כמות לא חוקית'; 
	if (Math.round(num) != num) //not whole quantity
          return_alert='כמות לא חוקית'; 
}
return return_alert;
}

function check_to_basket(itemNumber,id,price){
   var checkValue;
   checkValue=window.document.Form_to_basket.elements['quantity'+itemNumber].value;
   check_alert=checkValue.checker(checkValue,8)
   if (check_alert!=''){
      alert(check_alert)
   }   
   else{

	window.document.Form_to_basket.prodId.value=id
	window.document.Form_to_basket.quantity.value=window.document.Form_to_basket.elements['quantity'+itemNumber].value
	window.document.Form_to_basket.price.value=price
	//window.document.Form_to_basket.volume.value=volume
	window.document.Form_to_basket.submit()
	return false
   }
return false;

}


function changeQuant(changVal,itemNumber){
  //alert(itemNumber)
   currVal=window.document.Form_to_basket.elements['quantity'+itemNumber].value;
   //alert(currVal)
   if (changVal=='+' && !isNaN(currVal))
      currVal=eval(currVal)+1;
   else if (changVal=='-' && !isNaN(currVal))
      currVal=eval(currVal)-1;
   else if (changVal=='' && !isNaN(currVal)){
       check_alert=checkValue.checker(eval(currVal),5)
       if (check_alert!=''){
           alert(check_alert)
           currVal=0;
       }
       else{
         currVal=eval(currVal);
       }   
   }
   if (!isNaN(currVal)&& eval(currVal)>0 )
      window.document.Form_to_basket.elements['quantity'+itemNumber].value=currVal;
 return false;
}