var i=1;
var j=1;

if(document.getElementById('shadow_div_'+[i])){
    
    while(document.getElementById('shadow_div_'+[i])){
    
    document.getElementById('shadow_div_'+[i]).innerHTML='<img style="border:0; display:block;" src="http://www.dfi-erlangen.de/img/schatten_illus.png">';
  
      i=j;
        i=i+1;
        j++;
    }
//document.getElementById('shadow_div').innerHTML='<img class="shadow" src="http://dfi.munuxi.com/img/schatten_illus.png">';
}