function checkSymbol(s)
{
	var i;
   	for(i=0;i<s.length;i++)
   	{
		if((s.charAt(i)=='<')||(s.charAt(i)=='>')||(s.charAt(i)=='"'))
	   	{
			return false;
		}
	}
	return true;
}

/**************************************************************
 IsEmail: Returns a Boolean if the specified Expression is a
          valid e-mail address. If Expression is null, false
          is returned.

 Parameters:
      Expression = e-mail to validate.

 Returns: Boolean
***************************************************************/
function IsEmail(Expression)
{
	if (Expression == null)
		return (false);

	if(!checkSymbol(Expression))
    	{
		return (false);
	}

	var supported = 0;
	if (window.RegExp)
	{
		var tempStr = "a";
		var tempReg = new RegExp(tempStr);
		if (tempReg.test(tempStr)) supported = 1;
	}
	if (!supported)
		return (Expression.indexOf(".") > 2) && (Expression.indexOf("@") > 0);
	var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
	var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,4}|[0-9]{1,4})(\\]?)$");
	return (!r1.test(Expression) && r2.test(Expression));
}
function LTrim(String)
{
	var i = 0;
	var j = String.length - 1;

	if (String == null)
		return (false);

	for (i = 0; i < String.length; i++)
	{
		if (String.substr(i, 1) != ' ' &&
		    String.substr(i, 1) != '\t')
			break;
	}

	if (i <= j)
		return (String.substr(i, (j+1)-i));
	else
		return ('');
}
function RTrim(String)
{
	var i = 0;
	var j = String.length - 1;

	if (String == null)
		return (false);

	for(j = String.length - 1; j >= 0; j--)
	{
		if (String.substr(j, 1) != ' ' &&
			String.substr(j, 1) != '\t')
		break;
	}

	if (i <= j)
		return (String.substr(i, (j+1)-i));
	else
		return ('');
}
function Trim(String)
{
	if (String == null)
		return (false);

	return RTrim(LTrim(String));
}
function Len(string)
{
	if (string == null)
		return (false);

	return String(string).length;
}
function checkSymbol(s)
{
	var i;
   	for(i=0;i<s.length;i++)
   	{
		if((s.charAt(i)=='<')||(s.charAt(i)=='>'))
	   	{
			return false;
		}
	}
	return true;
}
function checkEmail(str){
	var textValue = str.value;
	var err=''
	if (textValue == ''){
		err += "Incorect email address";
		alert(err);
		str.focus();
		return false
	}
	if (textValue.indexOf('@') <= 0 || textValue.indexOf('@') == textValue.length -1){
		err += "- Incorect email address";		
	} else {
		var substr = textValue.substring(textValue.indexOf('@'),textValue.length);
		if (textValue.indexOf('.') <= 0) {
			err += "- Incorect email address";
		}
	}
	if (err != '') { 
		alert(err); 
		str.focus();
		return false;
	}
	return true;
}