function main(id)
{
   var a = document.getElementById(id);
   
   for (var i = 1; i<=10; i++){
      if (document.getElementById('mainmenu'+i) && document.getElementById('mainmenu'+i) != a) {
         document.getElementById('mainmenu'+i).style.display='none';
      }
   }
   
   if (a) {
      if (a.style.display == 'none') {
         a.style.display = 'block';
      }
      else {
         a.style.display = 'none';
      }
   }
}


function pferdezucht(id) {
   var b = document.getElementById(id);
   
   for (var j = 1; j<=10; j++) {
   	if (document.getElementById('submenu3'+j) && document.getElementById('submenu3'+j) != b)
      {
         document.getElementById('submenu3'+j).style.display='none';
      }
   }
   
   if (b) {
      if (b.style.display == 'none') {
		b.style.display = 'block';
      }
      else {
		b.style.display = 'none';
      }
   }
}


function verkauf(id) {
   var c = document.getElementById(id);
   
   for (var k = 1; k<=10; k++) {
   	if (document.getElementById('submenu4'+k) && document.getElementById('submenu4'+k) != c)
      {
         document.getElementById('submenu4'+k).style.display='none';
      }
   }
   
   if (c) {
      if (c.style.display == 'none') {
		c.style.display = 'block';
      }
      else {
		c.style.display = 'none';
      }
   }
}


function pferde(id) {
   var c = document.getElementById(id);
   
   for (var k = 1; k<=11; k++) {
   	if (document.getElementById('subsubmenu'+k) && document.getElementById('subsubmenu'+k) != c)
      {
         document.getElementById('subsubmenu'+k).style.display='none';
      }
   }
   
   if (c) {
      if (c.style.display == 'none') {
		c.style.display = 'block';
      }
      else {
		c.style.display = 'none';
      }
   }
}