function disableId(id_name) {
	var element = document.getElementById(id_name);
	element.disabled = true;
}


function enableId(id_name) {
	var element = document.getElementById(id_name);
	element.disabled = false;
}


function hideId(id_name) {
	var element = document.getElementById(id_name);
	element.style.display = 'none';
}


function showId(id_name) {
	var element = document.getElementById(id_name);
	element.style.display = '';
}


function toggleEnableDisableId(id_name) {
	var element = document.getElementById(id_name);

	if (element.style.enabled) {
		element.style.enabled = 'false';
	} else {
		element.style.enabled = 'true';
	}
}

Array.prototype.in_array = function(p_val) {
	for(var i = 0, l = this.length; i < l; i++) {
		if(this[i] == p_val) {
			return true;
		}
	}
	return false;
}