function showtext(zap) {
	   if (document.getElementById) {
	   var abra = document.getElementById(zap).style; 
	   var standaardinfo = document.getElementById("standaardinfo").style; 
	    if (abra.display == "block") {
	    // abra.display = "none";
	    } else {
	    abra.display= "block";
		standaardinfo.display= "none";
	   }
	   return false;
	   } else {
	   return true;
	  }
	  }
	  function hidetext(zap) {
	   if (document.getElementById) {
	   var abra = document.getElementById(zap).style;
	   var standaardinfo = document.getElementById("standaardinfo").style; 	   
	    if (abra.display == "block") {
	    abra.display = "none";
		standaardinfo.display= "block";		
	    } else {
	    // abra.display= "block";
	   }
	   return false;
	   } else {
	   return true;
	  }
	  }