var random_code = '';
function generate_code(el) {

    if (random_code == '') {
        random_code = randomString();
        var div1 = document.createElement ('DIV');
        div1.innerHTML = random_code;
        div1.id = 'random_code';
        el.appendChild(div1);
    }

    //document.getElementById('random_code').innerHTML = random_code ;
}

function randomString() {
	var chars = "0123456789";
	var string_length = 5;
	var randomstring = '';
	for (var i=0; i<string_length; i++) {
		var rnum = Math.floor(Math.random() * chars.length);
		randomstring += chars.substring(rnum,rnum+1);
	}
	return randomstring;
}

$(window).load(function() {
    $('#main_slider').nivoSlider();
});