function verifydata()
		{
		var error="";
		if(document.form.name.value=="")
			{  error= error + "Bitte den Namen eingeben.<br>";
				
			}	
		if(document.form.email.value=="")	
			{ error=error + "Bitte die Email-Adresse eingeben.<br>";
			  
			}
		if((document.form.email.value!="") && !checkemail(document.form.email.value))	
			{ error=error + "Bitte eine g&uuml;ltige Email-Adresse angeben.<br>";
			  
		  }
		if(document.form.tarea.value=="")
		{
			error=error + "Bitte Ihre Nachricht eingeben.<br>";
			  
		}
		
		if(error.length > 3)
			{
			document.getElementById('errors').style.display='block';
			document.getElementById('errors').innerHTML=error;
			return false;
			}	
		else 
			return true;
			
		}
		
function checkemail(email) {
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
     if(reg.test(email) == false) 
        return false;
	else 	
		return true;
   }
function show(id,flag)	
		{
			var j;
		if(flag==1)
			j=8;
		else j=10;
		var i;
		for(i=1;i<=j;i++)
		{
		
		 if(i==id)
			{
			
			document.getElementById("white_box"+ i).style.display='none';
			document.getElementById("black_box"+ i).style.display='block';
			document.getElementById("wtext"+ i).style.display='block';
			}
			else
			{
				if(document.getElementById("white_box"+ i)) {	
				document.getElementById("white_box"+ i).style.display='block';
				document.getElementById("black_box"+ i).style.display='none';
				document.getElementById("wtext"+ i).style.display='none';	
				}
			}
			}
		}
		function hide(id)	
		{
		document.getElementById("black_box"+id).style.display='none';
		document.getElementById("wtext"+id).style.display='none';
		document.getElementById("white_box"+id).style.display='block';
		}
		
		function show1(id)	
		{
		
		if(id=='daten')
		{	document.getElementById("daten").style.display='none';
			document.getElementById("daten1").style.display='block';
			hide1('dis1');
			hide1('copy1');
			hide1('impressum1');
	
	
			
		}
		else if(id=='dis')
		{
			document.getElementById("dis").style.display='none';
			document.getElementById("dis1").style.display='block';
			hide1('daten1');
			hide1('copy1');
			hide1('impressum1');
		
		}
		else if(id=='copy')
		{
			document.getElementById("copy").style.display='none';
			document.getElementById("copy1").style.display='block';
			hide1('dis1');
			hide1('daten1');
			hide1('impressum1');
		
		}
		else if(id=='impressum')
		{
			document.getElementById("impressum").style.display='none';
			document.getElementById("impressum1").style.display='block';
			
			hide1('dis1');
			hide1('daten1');
			hide1('copy1');
		}
		
		
		
		}
		function hide1(id)	
		{
		if(id=='daten1')
		{	document.getElementById("daten").style.display='block';
			document.getElementById("daten1").style.display='none';
			
			
		}
		else if(id=='dis1')
		{	document.getElementById("dis").style.display='block';
			document.getElementById("dis1").style.display='none';
			
			
		}
		else if(id=='copy1')
		{	document.getElementById("copy").style.display='block';
			document.getElementById("copy1").style.display='none';
			
			
		}
		else if(id=='impressum1')
		{
			document.getElementById("impressum").style.display='block';
			document.getElementById("impressum1").style.display='none';
			
		}
	}