function checkvacio(object_value){
	if (object_value.length == 0){
		return true;
	}
}

function checklogin(object_value)	{
	if (object_value.length == 0)
		return false;
	
	
	var hex_format = "0123456789abcdefghijklmnñopqrstuvwxyzABCDEFGHIJKLMNÑOPQRSTUVWXYZ_-";
	var check_char;	
	
	for (var i = 1; i < 37; i++) {				
		check_char = hex_format.indexOf(object_value.charAt(i));
		if (check_char < 0)
			return false;
		
	}
	return true;
}


function checkemail(object_value) {
	if (object_value.length == 0)
		return false;
	
	if (!(object_value.indexOf("@") > -1 && object_value.indexOf(".") > -1))
		return false;    
	
	return true;
}

function checknumber(object_value) {
	if (object_value.length == 0)
		return true;
	
	var start_format = " .+-0123456789";
	var number_format = " .0123456789";
	var check_char;
	var decimal = false;
	var trailing_blank = false;
	var digits = false;
	
	check_char = start_format.indexOf(object_value.charAt(0));
	if (check_char == 1)
		decimal = true;
	else if (check_char < 1)
		return false;
	 
	for (var i = 1; i < object_value.length; i++)	{
		check_char = number_format.indexOf(object_value.charAt(i))
		if (check_char < 0) {
			return false;
		} else if (check_char == 1)	{
			if (decimal)
				return false;
			else
				decimal = true;
		} else if (check_char == 0) {
			if (decimal || digits)	
			trailing_blank = true;
		}	else if (trailing_blank) { 
			return false;
		} else {
			digits = true;
		}
	}	
	
	return true;
}