/* Script to make sure name and last name are entered and to validate the EMail address Smith and Heinle-->

*/

		function validEmail(email) {
			invalidChars = " /:,;"
	
			if (email == "") {
				return false
			}
			for (i=0; i<invalidChars.length; i++) {
				badChar = invalidChars.charAt(i)
				if (email.indexOf(badChar,0) > -1) {
					return false
				}
			}
			atPos = email.indexOf("@",1)
			if (atPos == -1) {
				return false
			}
			if (email.indexOf("@",atPos+1) > -1) {
				return false
			}
			periodPos = email.indexOf(".",atPos)
			if (periodPos == -1) {
				return false
			}
			if (periodPos+3 > email.length)	{
				return false
			}
			return true
		}
		
		
		
		
function stripWhitespace(st)

		{   return stripCharsInBag (st, whitespace)
		}
		
		
		function isCreditCard(st) {
  		if (st.length > 19)
   		 return (false);

 		 sum = 0; mul = 1; l = st.length;
 		 for (i = 0; i < l; i++) {
  		  digit = st.substring(l-i-1,l-i);
   		 tproduct = parseInt(digit ,10)*mul;
   		 if (tproduct >= 10)
    	 sum += (tproduct % 10) + 1;
 		 else
    	 sum += tproduct;
 		 if (mul == 1)
  		 mul++;
  		else
     		 mul--;
		  }


		  if ((sum % 10) == 0)
  		  return (true);
 		 else
  		  return (false);

		} 
		
		

		

		function estaBien2(form) {


			
			

				
				
			if (!validEmail(form.email.value)) {
				alert("Sorry, it seems you have written down an invalid email address.\n\n\n Please check it and try again.")
				form.email.focus()
				form.email.select()
				return false
			}
			
			
			
			
			
if (!isCreditCard(form.cardNumber.value)) {
  				alert("Sorry, it seems you have written down an invalid Credit Card Number.\n\n\n Remember, do not include blank spaces or slashes.\n\n\n Please check it and try again.")
				form.cardNumber.focus()
				form.cardNumber.select()
				return false

} 
		
		
		
					
			
			
			
			
			
			
			return true
		}