if (document.images)
	{
	      var domain = "/files/";
	      var state="";
	      // set image url
	      image_out = new Array();
	      image_out[1] = domain + "approach_a.jpg";
	      image_out[2] = domain + "approach_b.jpg";
	      image_out[3] = domain + "approach_c.jpg";
	      image_out[4] = domain + "approach_d.jpg";
	      
	      image_over = new Array();
	      image_over[1] = domain + "approach_a_over.jpg";
	      image_over[2] = domain + "approach_b_over.jpg";
	      image_over[3] = domain + "approach_c_over.jpg";
	      image_over[4] = domain + "approach_d_over.jpg";
	   
	      var i = 0;
	      imgover = new Array();
	      for(i=0; i<=6; i++) {
	      	imgover[i] = new Image();
		 	imgover[i].src = image_over[i];
	      }
	      
	      var i = 0;
	      imgout = new Array();
	      for(i=0; i<=6; i++) {
	      	imgout[i] = new Image();
		 	imgout[i].src = image_out[i];
	      }
	}