// JavaScript Document

function IsNumeric(sText)
{
   var ValidChars = "0123456789";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
}

// Ensures the customer enters a valid number and a quantity greater than 0
function validAddItem(){		
		f = document.forms[1];
  		if(f.quantity.value==""){
				alert("Please enter a quantity.        ");
				f.quantity.focus();
				return false;				
		}
		if(f.quantity.value<1){
				alert("Please enter a quantity greater than 0.     ");
				f.quantity.focus();
				return false;
		}
		if(f.quantity.value!=""){
				isnum = IsNumeric(f.quantity.value);
				if(!isnum){
						alert("Please enter a valid number.        ");
						f.quantity.focus();
						return false;
				}
		}
	
		
}