function checkemail(value)
{
	var filter=/^(("[\w-\s]+")|([\w-]+(?:\.[\w-]+)*)|("[\w-\s]+")([\w-]+(?:\.[\w-]+)*))(@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$)|(@\[?((25[0-5]\.|2[0-4][0-9]\.|1[0-9]{2}\.|[0-9]{1,2}\.))((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\.){2}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\]?$)/i
	if (filter.test(value))
		return true;
	else
		return false;
}
		
function stristr(haystack, needle)
{
	var pos = 0;
	haystack += '';
	pos = haystack.toLowerCase().indexOf( (needle+'').toLowerCase() );
	if (pos == -1)
		return false;
	else
		return true;
}

function remove_string_from_string(haystack, needle, bool)
{
	var pos = 0; 
    haystack += '';
    pos = haystack.toLowerCase().indexOf((needle+'').toLowerCase());
	if (pos == -1)
        return false;
    else
	{
		if (bool)
			return haystack.substr(0, needle.length);	//remove everything else and return needle string.
		else
            return haystack.substr(needle.length);		//remove needle in front and return everything else.
    }
}

function doDefault(obj, compare_to_value, new_value)
{
	if (obj.value == compare_to_value)
		obj.value = new_value;
}

function rtrim(str, charlist)
{
	charlist = !charlist ? ' \\s\u00A0' : (charlist+'').replace(/([\[\]\(\)\.\?\/\*\{\}\+\$\^\:])/g, '\\$1');
	var re = new RegExp('[' + charlist + ']+$', 'g');
	return (str+'').replace(re, '');
}