function switchflash(i) {

var maxpub= document.getElementById('maxpub').value;
var maxtime= document.getElementById('maxtime').value;
 slide="slide"+Number(i);

 document.getElementById(slide).style.display='none';
 if(i==Number(maxpub)) i=0;
 i=i+1;
 slide="slide"+Number(i);
 document.getElementById(slide).style.display='block';

window.setTimeout("switchflash("+Number(i)+")",Number(maxtime));
}