var npag = "" ; 
  function init() {
      showtxt( "txt1" );
       }

   function showtxt( nm ) {
      document.getElementById( "txt1" ).style.visibility="hidden";
      document.getElementById( nm ).style.visibility="visible";
      }

   function setupper( fld ) {
      fld.value= fld.value.toUpperCase()
      }

   function setcolor( srt, nm ) {
      if (srt==1) { document.nvhinfo.elements[ nm ].style.color = "#66CCFF";  }
      else if (srt==0) { document.nvhinfo.elements[ nm ].style.color = "black"; }
      } 

   function Datacheck (){
 
      var  msgw="" ;
      var l=0;
    
      for (var i = 1; i < document.nvhinfo.elements.length; i++) {
         l =  document.nvhinfo.elements[ i ].name.length ;
         if ( document.nvhinfo.elements[ i ].name.charAt(  l -1) == "!" ) {
              if  ( document.nvhinfo.elements[ i ].value == "" )
                  {  msgw +=  document.nvhinfo.elements[ i ].name.substr( 0, l-1)+"\n   ";  } }
            }

         if  ( msgw.length > 0 ) {
              alert( "De volgende veld(en) dienen ingevuld te zijn: "+"\n   "+msgw );
                      }
         else { document.nvhinfo.submit() ;
                alert( "Het informatieformulier wordt verzonden") ;
                self.history.back(); }
      }

   var IE = (navigator.userAgent.indexOf("MSIE") != -1) && (navigator.userAgent.indexOf("Opera") == -1);
   if (IE==true) 
      {document.write( "<LINK HREF=\"nvh.css\" REL=\"stylesheet\" TYPE=\"text/css\">"); }
   else
      {document.write( "<LINK HREF=\"nvhn.css\" REL=\"stylesheet\" TYPE=\"text/css\">"); }