var curImage = 1;
var countImages = 4; 
setTimeout("writeImage()", 3000);

	function initTimer() {
    	setTimeout("writeImage()", 3000);
    }
          	
    function writeImage() {
    	for (i = 1; i<=4; i++) {
          	if ($('#main_image_'+i).css('display') == 'block') {
          			$('#main_image_'+i).css('display', 'none');
          			curImage = i;
          			break;
          		}
          }
          if (curImage == countImages) {
          		curImage = 1;
          		$('#main_image_1').fadeIn("slow");
          } else {
          		curImage++;
          		$('#main_image_'+curImage).fadeIn("slow");
          }
          initTimer();
          		
	}