var ie = document.all?1:0;
var w3c = document.getElementById?1:0;
var ns4 = document.layers?1:0;

var nextPic = new Image();
var index = 0;

var pix = new Array();

pix[0] = '../images/betonsanierung/01.jpg';
pix[1] = '../images/betonsanierung/02.jpg';
pix[2] = '../images/betonsanierung/03.jpg';
pix[3] = '../images/betonsanierung/04.jpg';


function changePic(direction) {
 index += direction;
 if(index > pix.length - 1) index = 0;
 else if(index < 0) index = pix.length - 1;
 nextPic.src = pix[index];
 if(ie||w3c) {
 document.getElementsByName('change')[0].src = nextPic.src;
 
 }

 else if(ns4) {
 document['bilder'].document.change.src = nextPic.src;
 with(document.txt.document) {
 open();
 write(comm[index]);
 close();
  }
 }
}