function showBox() {
document.getElementById('themen').style.visibility = 'visible';
}

function hideBox() {
document.getElementById('themen').style.visibility = 'hidden';
}



function showBox2() {
document.getElementById('zeitschriften').style.visibility = 'visible';
}

function hideBox2() {
document.getElementById('zeitschriften').style.visibility = 'hidden';
}

var x_pos = 5;
var y_pos = 10;

function adjust() {
  if (document.all) {
   x_pos = document.all.leftcol.style.pixelLeft;
   y_pos = document.all.leftcol.style.pixelTop;
  } else if (document.getElementById) {
	document.getElementById("leftcol").style.position = "fixed";
   return;
  }
 check();
}

function check() {
  if(document.all) {
   var x_scroll = document.body.scrollLeft;
   var y_scroll = document.body.scrollTop;
 }
set(x_scroll, y_scroll);
setTimeout("check()", 20);
}
function set(x_scroll, y_scroll) {
  if (document.all) {
   document.all.leftcol.style.pixelLeft = x_pos + x_scroll;
   document.all.leftcol.style.pixelTop = y_pos + y_scroll;
 }
}

function swapbg(element) { 

		element.style.borderLeft = "20px solid #bb2b00";
		element.style.borderRight = "1px solid #bb2b00";
		element.style.borderTop = "1px solid #bb2b00";
		element.style.borderBottom = "1px solid #bb2b00";
		element.style.paddingLeft = "10px";
}
	
function swapnormal(element) {
		element.style.borderLeft = "30px solid #f2f2f2";
		element.style.borderRight = "1px solid #f2f2f2";
		element.style.borderTop = "1px solid #f2f2f2";
		element.style.borderBottom ="1px solid #f2f2f2";
		element.style.paddingLeft = "0px";
}

function pruefen() {
    var f = document.MeinFormular;
    if( null == f.abo_firstname.value || "" == f.abo_firstname.value )
      { alert( "Kein Vorname angegeben" );
        return false; }
    if( null == f.abo_lastname.value || "" == f.abo_lastname.value )
      { alert( "Kein Nachname angegeben!" );
        return false; }
if( null == f.abo_street.value || "" == f.abo_street.value )
      { alert( "Keine Straße angegeben!" );
        return false; }
if( null == f.abo_plz.value || "" == f.abo_plz.value )
      { alert( "Keine Postleitzahl angegeben!" );
        return false; }
if( null == f.abo_city.value || "" == f.abo_city.value )
      { alert( "Kein Ort angegeben!" );
        return false; }
if (!f.agb.checked )
      { alert( "Bitte akzeptieren Sie unsere allgemeinen Geschäftsbedingungen!" );
        return false; }
		
    confirm( "Hiermit bestätige ich, dass alle Angaben der Wahrheit entsprechen" );
    return true;
  }