function show(firma) {
 	if(firma=='michow')
    document.getElementById('michow').style.display = "block";
 	if(firma=='langer') 	
    document.getElementById('langer').style.display = "block";
	if(firma=='ilco') 	
    document.getElementById('ilco').style.display = "block";
	if(firma=='ggl') 	
    document.getElementById('ggl').style.display = "block";
	if(firma=='heier') 	
    document.getElementById('heier').style.display = "block";
	}
	function hide(firma) {
 	if(firma=='michow')
    document.getElementById('michow').style.display = "none";
 	if(firma=='langer')
    document.getElementById('langer').style.display = "none";
	if(firma=='ilco') 	
    document.getElementById('ilco').style.display = "none";
	if(firma=='ggl') 	
    document.getElementById('ggl').style.display = "none";
	if(firma=='heier') 	
    document.getElementById('heier').style.display = "none";
	}