function isValidEmail(text_box_class_name, err_msg_id)
{	
	err_msg = 'Your email is invalid format.';
	email = $('.'+text_box_class_name);			
	if(!/^([a-zA-Z0-9_\.])+\@([a-zA-Z0-9\-])+\.([a-zA-Z0-9]{2,4})(\.[a-zA-Z0-9]{2,4})?$/.test(email.val()))
	{			
		email.focus();
		if(err_msg_id!=null) $('#'+err_msg_id).html(err_msg);
		else alert(err_msg);
		return false;
	}
	return true;
}

function link_to(link)
{
	window.location = index()+link; 
}

function IsNumeric(strString, option) 
{ 
	if(option==null || option==false)
	    var strValidChars = "0123456789"; 
	else var strValidChars = "0123456789."; 	
    var strChar; 
    var blnResult = true; 

    if (strString.length == 0) 
        return false; 
    for (i = 0; i < strString.length && blnResult == true; i++) 
    { 
        strChar = strString.charAt(i); 
        if (strValidChars.indexOf(strChar) == -1) 
        { 
            blnResult = false; 
        } 
     } 
	return blnResult; 
}