var state = 'hidden';
function showhide(layer_ref) {
if (state == 'visible') {
state = 'hidden';
}
else {
state = 'visible';
}
if (document.all) { //IS IE 4 or 5 (or 6 beta)
eval( "document.all." + layer_ref + ".style.visibility = state");
}
if (document.layers) { //IS NETSCAPE 4 or below
document.layers[layer_ref].visibility = state;
}
if (document.getElementById && !document.all) {
maxwell_smart = document.getElementById(layer_ref);
maxwell_smart.style.visibility = state;
}
}




function pop(strURL,strHeight,strWidth,opt) {
if (window.screen) {
  var winl = (screen.width-strWidth)/2;
  var wint = (screen.height-strHeight)/2;
  var placering = "top=" + wint + ",left=" + winl + ",";
}
var strOptions="";
strOptions=opt+placering+"height="+strHeight+",width="+strWidth;
window.open(strURL, 'newWin', strOptions);
}