function ValidateZoeken(frm){
  var err;
  err="";
  if (frm.elements['searchString'].value=="") err+="U heeft geen zoekstring ingevuld\n";
  if (err=="") 
    return true;
  else{
    alert(err);
    return false;
  }
}

function setScroll(){


  //bar = document.getElementById("TR_Banner").offsetHeight;
  bar = 0;
  menu = document.getElementById("TR_Menu").offsetHeight;
  //banner = document.getElementById("TR_Banner").offsetHeight;
  //copyright = document.getElementById("TR_Copyright").offsetHeight;
  banner = 0;
  copyright = 84;
  if(document.getElementById("ScrollLeft") != null)
    document.getElementById("ScrollLeft").style.display = "none";

  if(document.getElementById("ScrollRight") != null)
    document.getElementById("ScrollRight").style.display = "none";

  InnerHeight=document.body.clientHeight-bar-menu-banner-copyright;
  //ScrollLeftHeight=InnerHeight-7;
  //ScrollRightHeight=InnerHeight+12-7;
  
  ScrollLeftHeight=InnerHeight;
  ScrollRightHeight=InnerHeight;

  if(document.getElementById("ScrollLeft") != null)
    document.getElementById("ScrollLeft").style.display = "";

  if(document.getElementById("ScrollRight") != null)
    document.getElementById("ScrollRight").style.display = "";

  if(document.getElementById("ScrollLeft") != null)
    document.getElementById("ScrollLeft").style.height=ScrollLeftHeight+"px";

  if(document.getElementById("ScrollRight") != null)
    document.getElementById("ScrollRight").style.height=ScrollRightHeight+"px";
}