function selectCheckboxes(what,pref){
  for(i=0;i<what.elements.length;i++){
    if(what.elements[i].type == "checkbox" && what.elements[i].name.substring(0,pref.length) == pref){
    	if(what.elements[i].checked)
    	what.elements[i].checked = '';
    	else
    	what.elements[i].checked = 'checked';
    }
  }
}

function show(co) {
var obiekt = document.getElementById(co);
if (obiekt.style.display == 'block') {
obiekt.style.display = 'none';
} else {
obiekt.style.display = 'block';
}
} 

function hide(co) {
var obiekt = document.getElementById(co);
obiekt.style.display = 'none';
} 

function maxLength1(o,v,m){
	if(o.value.length>m){
	  document.getElementById(v).innerHTML=
	    ((o.value=o.value.substr(0,m)).length);
    }
    else{
    document.getElementById(v).innerHTML=o.value.length;
    }
}