function VerifyData(form1) {
  var num = form1.elements.length
  for (var i=0; i<num; i++) {
    if ((form1.elements[i].name.charAt(0) == 'R') && 
	    (form1.elements[i].value == null ||
	     form1.elements[i].value == "")) {
	  var field = form1.elements[i].name
	  for (var j=0; j<field.length; j++) {
	    if (field.charAt(j) == '_') { 
		  field = field.substring(0,j) + " " + field.substring(j+1,field.length)
		  break
		}
      }
	  form1.elements[i].focus()
	  alert("Please enter a value for the '" + field.substring(1,field.length) + "' field.")
	  return false 
	}
	else if ((form1.elements[i].name.substring(0,2) == 'sh') && 
	         (form1.elements[i].value == null ||
	          form1.elements[i].value == "") &&
			 (form1.elements[i].name != 'sh_Instructions')) {
	  var field = form1.elements[i].name 
	  form1.elements[i].focus()
	  alert("Please enter shipping information.") 
	  return false 
    }
  }
  if (form1.Pay_Method[0].checked) {
    var currDate = new Date()
    if (form1.exp_year.value == (currDate.getYear()).toString()) { 
	  var mo = form1.exp_month.value
	  if (mo.charAt(0) == '0') {
	  	mo = mo.substring(1,2)
	  } 
      if (parseInt(mo) < (currDate.getMonth() + 1)) {
        alert("Your credit card is expired! \nYou submitted: " + mo + " \nCurrent date: " + (currDate.getMonth() + 1))
	    return false
	  }
    }
	if (form1.Card_Number.value == "") {
		form1.Card_Number.focus()
	    alert("Please enter your credit card number!")
	    return false
	}
	if (form1.Card_Number.value.search(/\d{16}/) == -1){
		form1.Card_Number.focus()
	    alert("Please a valid credit card number!")
	    return false
	}
  }
  if (form1.RZip.value.search(/\d{5}/) == -1) {
  	form1.RZip.focus()
  	alert("Please enter a valid billing zip code.")
	return false
  }
  if ((form1.sh_Zip.value.search(/\d{5}/) == -1) ||
  		(isInteger(form1.sh_Zip) || form1.sh_Zip.length != 5)){
  	form1.sh_Zip.focus()
  	alert("Please enter a valid shipping zip code.")
	return false
  }
  if (form1.REmail.value.search(/\w+@\w+\-?\w+?\.\w*.?\w{3}/) == -1) {
  	form1.REmail.focus()
  	alert("Please enter a valid e-mail address.")
	return false
  }
  if (form1.sh_State.value.toUpperCase() == "HI" || 
      form1.sh_State.value.toUpperCase() == "AK") {
	var msg = "Would you like your shipment sevt via " +
	          "Priority Mail? \n" +
			  "(less expensive than 2nd Day Air)";
    //var i = GetCheckedIndex(form1.Shipping_Method)
	//form1.Shipping_Method[i].checked = true
	if (confirm(msg)) {
	   form1.Shipping_Method[4].checked = true
	}
	else
	   form1.Shipping_Method[2].checked = true
  }
  return true
}

function GetCheckedIndex(check_obj) {
  for (var i=0;i<3;i++) {//works only for more than 2 radio buttons
	if (check_obj[i].value == "2DA") {
	  flag = true;
	  break;
	 }
  } return i;

}

function SubmitOnCheck(form1) {
		if (form1.size.value == "NoChoice") {
			form1.size.focus();
			alert("Please select a size before adding this item to your cart.");
		} else {
			form1.submit();
			return true;
		}
}

function VerifySize(form1, qty) {	// Yoon's note: I replaced this function with SubmitOnCheck.
   if (qty == 0)
	  return false;
//	I, Yoon, don't understand what the following part does, so commented out.
//	if (window.name=="popup"){
//		if (form1.size.value == "select") {
//			form1.size.focus()
//			alert("Please select a size before adding this item to your cart.")
//			return false
//		}
//		else {
//  			window.opener.onload=window.close();
//		}
//	}

	if (form1.size.value == "NoChoice") {
		form1.size.focus()
		alert("Please select a size before adding this item to your cart.")
		return false;
	}else {
		return true;
	}

} 

function VerifyQuantity(form1) {
  var num = form1.elements.length
  for (var i=0; i<num; i++) {
	 var field = form1.elements[i].name
	 if (field.substring(0,3) == "qty") {  
	     if (parseInt(form1.elements[i].value) < 1) {
		     form1.elements[i].focus()
			 alert("Quantity must be greater than 0!")
			 return false;
		 }
	 }
  }
  return true;
}


// isInteger (STRING s [, BOOLEAN emptyOK])
// 
// Returns true if all characters in string s are numbers.
//
// Accepts non-signed integers only. Does not accept floating 
// point, exponential notation, etc.
//
// We don't use parseInt because that would accept a string
// with trailing non-numeric characters.
//
// By default, returns defaultEmptyOK if s is empty.
// There is an optional second argument called emptyOK.
// emptyOK is used to override for a single function call
//      the default behavior which is specified globally by
//      defaultEmptyOK.
// If emptyOK is false (or any value other than true), 
//      the function will return false if s is empty.
// If emptyOK is true, the function will return true if s is empty.
//
// EXAMPLE FUNCTION CALL:     RESULT:
// isInteger ("5")            true 
// isInteger ("")             defaultEmptyOK
// isInteger ("-5")           false
// isInteger ("", true)       true
// isInteger ("", false)      false
// isInteger ("5", false)     true

function isInteger (s)

{   var i;

    if (isEmpty(s)) 
       if (isInteger.arguments.length == 1) return defaultEmptyOK;
       else return (isInteger.arguments[1] == true);

    // Search through string's characters one by one
    // until we find a non-numeric character.
    // When we do, return false; if we don't, return true.

    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);

        if (!isDigit(c)) return false;
    }

    // All characters are numbers.
    return true;
}