function isEmailAddr(email)
{
  var result = false;
  var theStr = new String(email);
  var index = theStr.indexOf("@");
  if (index > 0)
  {
    var pindex = theStr.indexOf(".",index);
    if ((pindex > index+1) && (theStr.length > pindex+1))
        result = true;
  }
  return result;
}

function validRequired(formField,fieldLabel)
{
        var result = true;

        if (formField.value == "")
        {
                alert('Please enter a value for the "' + fieldLabel +'" field.');
                formField.focus();
                result = false;
        }

        return result;
}

function allDigits(str)
{
        return inValidCharSet(str,"0123456789");
}

function inValidCharSet(str,charset)
{
        var result = true;

        // Note: doesn't use regular expressions to avoid early Mac browser bugs
        for (var i=0;i<str.length;i++)
                if (charset.indexOf(str.substr(i,1))<0)
                {
                        result = false;
                        break;
                }

        return result;
}

function validEmail(formField,fieldLabel,required)
{
        var result = true;

    /*    if (required && !validRequired(formField,fieldLabel))
                result = false;  */

        if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) )
        {
                alert("Please enter a complete email address in the form: yourname@yourdomain.com");
                formField.focus();
                result = false;
        }

  return result;

}

function validNum(formField,fieldLabel,required)
{
        var result = true;

    /*    if (required && !validRequired(formField,fieldLabel))
                result = false;  */

         if (result)
         {
                 if (!allDigits(formField.value))
                 {
                         alert('Please enter a number for the "' + fieldLabel +'" field.');
                        formField.focus();
                        result = false;
                }
        }

        return result;
}


function validInt(formField,fieldLabel,required)
{
        var result = true;

        if (required && !validRequired(formField,fieldLabel))
                result = false;

         if (result)
         {
                 if (isNaN(formField.value))
                 {
                         alert('Please enter a number for the "' + fieldLabel +'" field.');
                        formField.focus();
                        result = false;
                }
        }

        return result;
}


function validDate(formField,fieldLabel,required)
{
        var result = true;

        if (required && !validRequired(formField,fieldLabel))
                result = false;

         if (result)
         {
                 var elems = formField.value.split("/");

                 result = (elems.length == 3); // should be three components

                 if (result)
                 {
                         var month = parseInt(elems[0],10);
                          var day = parseInt(elems[1],10);
                         var year = parseInt(elems[2],10);
                        result = allDigits(elems[0]) && (month > 0) && (month < 13) &&
                                         allDigits(elems[1]) && (day > 0) && (day < 32) &&
                                         allDigits(elems[2]) && ((elems[2].length == 2) || (elems[2].length == 4));
                 }

                  if (!result)
                 {
                         alert('Please enter a date in the format MM/DD/YYYY for the "' + fieldLabel +'" field.');
                        formField.focus();
                }
        }

        return result;
}

function show(e) {
	if (document.getElementById) {
		// this is the way the standards work
		if(document.getElementById(e) != null) {
			document.getElementById(e).style.visibility = "visible";
			document.getElementById(e).style.display = "";
		}
	} else if (document.all) {
		// this is the way old msie versions work
		if(document.all[e] != null ) {
			document.all[e].style.visibility = "visible";
			document.all[e].style.display = "";
		}
	} else if (document.layers) {
		// this is the way nn4 works
		if(document.layers[e] != null) document.layers[e].visibility = "visible";
	}
}

function hide(e) {

	if (document.getElementById) {
		if(document.getElementById(e) != null) {
			// this is the way the standards work
			document.getElementById(e).style.visibility = "hidden";
			document.getElementById(e).style.display = "none";
		}
	} else if (document.all) {
		// this is the way old msie versions work
		if(document.all[e] != null ) {
			document.all[e].style.visibility = "hidden";
			document.all[e].style.display = "none";
		}
	} else if (document.layers) {
		// this is the way nn4 works
		if(document.layers[e] != null) document.layers[e].visibility = "hidden";
	}
}