var ids=new Array('dzien1','dzien2','dzien3','dzien4','dzien5','dzien6','dzien7');

function switchid(id){
 hideallids();
 showdiv(id);
}

function hideallids(){

 for (var i=0;i<ids.length;i++){
 hidediv(ids[i]);
 }
}

function hidediv(id) {

 if (document.getElementById) { // DOM3 = IE5, NS6
 document.getElementById(id).style.display = 'none';
 }
 else {
 if (document.layers) { // Netscape 4
 document.id.display = 'none';
 }
 else { // IE 4
 document.all.id.style.display = 'none';
 }
 }
}

function showdiv(id) {
 //safe function to show an element with a specified id

 if (document.getElementById) { // DOM3 = IE5, NS6
 document.getElementById(id).style.display = 'block';
 }
 else {
 if (document.layers) { // Netscape 4
 document.id.display = 'block';
 }
 else { // IE 4
 document.all.id.style.display = 'block';
 }
 }
}