function getCookie(name) {
	var arg = name + "=";
	var c = document.cookie;
	var i = 0;
	do {
		var j = i + arg.length;
		if (c.substring(i, j) == arg) {
			var k = c.indexOf(";", j);
			if (k == -1) k = c.length;
			return unescape(c.substring(j, k));
		}
		i = c.indexOf(" ", i) + 1;
	} 
	while (i != 0);
	return null;
}
//date : the number of day till expire
function setCookie(name, value, numdate) {
	var argv = setCookie.arguments;
	var argc = setCookie.arguments.length;	
	var exp = new Date();
	exp.setDate(exp.getDate() + numdate);
	
	var c = name + "=" + escape(value);
	    c += "; expires=" + exp.toGMTString();
		c += "; path=/";
	
	document.cookie = c;
}

function deleteCookie(name) {
	var exp = new Date();
	exp.setTime(exp.getTime() - 1);
	var c = name + "=" + escape(getCookie(name));
	c += "; expires=" + exp.toGMTString();
	document.cookie = c;
} 

function copyContent(source,target) {
	document.getElementById(target).value = source.value;
}