var timer;
				var counter=0;

				function change_image(){

					var thumbs= new Array();
					var i=document.getElementById('kep');

					thumbs[0]="1.jpg";
					thumbs[1]="2.jpg";
					thumbs[2]="3.jpg";
					thumbs[3]="4.jpg";

					if(counter==4)
						counter=0;

					i.src=thumbs[counter];

					counter++;
					timer=setTimeout("change_image()",5000);

				}