function swap() {
			var resimler= 
			[
				["images/bg1.jpg","black"],
				["images/bg6.jpg","black"],
				["images/bg1.jpg","black"],
				["images/bg6.jpg","black"],
				["images/bg1.jpg","black"],
				["images/bg6.jpg","black"],
				["images/bg1.jpg","black"]
			]
			
			
			x=(Math.floor(Math.random()*resimler.length));
			document.getElementById("banner").style.background="url('"+resimler[x][0].toString()+"') top center no-repeat " + resimler[x][1].toString();				
		}
	
	window.onload=swap;