function check(){
   var name = document.getElementById('name');
   var email = document.getElementById('email');
   var message = document.getElementById('message');
   if(name.value == "" || email.value == "" || message.value == "" ){
  alert("Alle Felder sind erforderlich");
  return false ;		
  }
  return true;


}
function more_results() {
document.getElementById('more').style.display='block';
}

function favorites(title, url) {
    if (window.sidebar) {
        // ff
        window.sidebar.addPanel(title, url, '');
    } else if (window.opera && window.print) {
        // opera
        var elem = document.createElement('a');
        elem.setAttribute('href', url);
        elem.setAttribute('title', title);
        elem.setAttribute('rel',' sidebar');
        elem.click();
    } else if (document.all) {
        // ie
        window.external.AddFavorite(url, title);
    };
};
function swap(){

 var x = document.con.von.value;
 var y = document.con.zu.value;
 
 document.con.von.value = y;
 document.con.zu.value = x;
 
}
function calc(func){
if(func == "cos"){
	var val = document.getElementById('val').value;
	var val = val.replace(/,/, ".");
	//var odabir = document.forma.odabir.value;
	if(document.fr.chose[0].checked){
			var result = Math.cos(val);
		}else if(document.fr.chose[1].checked){
			var result = Math.acos(val);
		}else{
			var result = 'error';
		}
	document.getElementById('box1').style.display='block';
	document.getElementById('res').value = result;
}
if(func == "sin"){
	var val2 = document.getElementById('val2').value;
	var val2 = val2.replace(/,/, ".");
	//var odabir = document.forma.odabir.value;
	if(document.fr2.chose2[0].checked){
			var result2 = Math.sin(val2);
		}else if(document.fr2.chose2[1].checked){
			var result2 = Math.asin(val2);
		}else{
			var result2 = 'error';
		}
	document.getElementById('box2').style.display='block';
	document.getElementById('res2').value = result2;
}
if(func == "tan"){
	var val3 = document.getElementById('val3').value;
	var val3 = val3.replace(/,/, ".");
	//var odabir = document.forma.odabir.value;
	if(document.fr3.chose3[0].checked){
			var result3 = Math.tan(val3);
		}else if(document.fr3.chose3[1].checked){
			var result3 = Math.atan(val3);
		}else{
			var result3 = 'error';
		}
	document.getElementById('box3').style.display='block';
	document.getElementById('res3').value = result3;
}
}