randomImage(['lorca1.jpg','lorca2.jpg','lorca3.jpg','conversation1.jpg','conversation2.jpg','conversation3.jpg']);
	function randomImage(imgArr)
	{
		var imgSrc, imgW, imgH, r;
    		r = randomNumber(imgArr.length);
      		imgSrc = imgArr[r];
  		document.write('<IMG SRC=images/'+imgSrc+' width=600px>');
  	}