function traffic_cam(cam, link)
{
	var image = document.getElementById('traffic_image');
	image.src = "http://www.dublincity.ie/dublintraffic/Site0Camera" + cam + ".jpg?" + random_num();

	change_text(link, "bold")
	
	if (link == "coolock")
		change_text("eastwall", "normal"); 
	else
		change_text("coolock", "normal");
	
	return false;	
}

function change_text(name, weight)
{
	element = document.getElementById(name + '_link');
	element.style.fontWeight = weight;
}

function random_num() 
{
	
	var chars = "0123456789";
	var string_length = 6;
	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;
}