function isDate(dateStr)
 {
    var datePat = /^(\d{1,2})(\/|-)(\d{1,2})(\/|-)(\d{4})$/;
    var matchArray = dateStr.match(datePat); // is the format ok?
	
    

    month = matchArray[1]; // parse date into variables
    day = matchArray[3];
    year = matchArray[5];

    if (month < 1 || month > 12)
    {  // check month range
        alert("Month must be between 1 and 12.");
        return false;
    }

    if (day < 1 || day > 31)
    {
        alert("Day must be between 1 and 31.");
        return false;
    }

    if ((month==4 || month==6 || month==9 || month==11) && day==31)
    {
        alert("Month "+month+" doesn't have 31 days!")
        return false;
    }

    if (month == 2)
    {
        // check for february 29th
        //var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
        var isleap = (year % 4 == 0);
        if (day > 29 || (day==29 && !isleap))
         {
            alert("February " + year + " doesn't have " + day + " days!");
            return false;
         }
    }
    return true; // date is valid
}

function isEmail(str)
 {
	// are regular expressions supported?
	var supported = 0;
	if (window.RegExp)
	 {
		var tempStr = "a";
		var tempReg = new RegExp(tempStr);
		if (tempReg.test(tempStr)) supported = 1;

	 }
	if (!supported)
		return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
	var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
	var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
	return (!r1.test(str) && r2.test(str));
}

function isValidEmail(strEmail)
{
  validRegExp = /^[^@]+@[^@]+.[a-z]{2,}$/i;
  str = strEmail.value;

   // search email text for regular exp matches
    if (str.search(validRegExp) == -1) 
   {
      alert('A valid e-mail address is required.\nPlease amend and retry');
      return false;
    } 
    return true; 
}

function checkfld(fld,str1)
{
	str=new String(str1);
	if (fld.value.length==0) return true;
	for (var i=0;i<fld.value.length;i++)
	{
		found=false;
		for (var j=0;j<str.length;j++)
			if((fld.value.substring(i,i+1))==(str.substring(j,j+1)))
			{
				found=true;
				break;
	        }
		if (!found)
		{
			return false;
		}
    }
	return true;

}

function showErrorField(fld,errmsg)
{
	alert(errmsg);
	fld.focus();
	fld.select();
}

function isEmpty(fld)
{
	var str = fld.value;
	if(fld.value==null || fld.value=="" || (str.substring(0,1)==""))
		return true;
	return false;
}

function isNum(fld)
{
	return checkfld(fld,"0123456789.-()");
}

function isSpace(fld)
{
	var r1 = new RegExp("^[ ]+$");
	return r1.test(fld.value);
}


function isSelectFldEmpty(sfld)
{
	sval=sfld.options[sfld.selectedIndex].value;
	if(sval=="")
		return true;
	return false;
}

function hasCommaQuote(fld)
{
	
	if(fld.value.indexOf(",")>=0 || fld.value.indexOf("'")>=0)
		return true;
	return false;
}