get cookie

Get a cookie.

function getCookie(c_name){
	var c_value = document.cookie;
	var c_start = c_value.indexOf(\" \" + c_name + \"=\");
	if (c_start == -1){
		c_start = c_value.indexOf(c_name + \"=\");
	}
	if (c_start == -1){
		c_value = null;
	} else {
		c_start = c_value.indexOf(\"=\", c_start) + 1;
		var c_end = c_value.indexOf(\";\", c_start);
		if (c_end == -1){
			c_end = c_value.length;
		}
	c_value = unescape(c_value.substring(c_start,c_end));
	}
	return c_value;
}