function setSkin(skin,module){

  //document.getElementById('css_logo').className = 'frisbeer_banner frisbeer_banner_'+skin;  
  document.getElementById('css_layout').href = 'style/'+skin+'/layout.css';
  document.getElementById('css_colors').href = 'style/'+skin+'/colors.css';
  document.getElementById('css_menu').href = 'modules/style/'+skin+'/15.css';
  if(document.getElementById('css_module'))document.getElementById('css_module').href = 'modules/style/'+skin+'/'+module+'.css';
  set_cookie("skin",skin,2029,12,31);
}

function set_cookie ( name, value, exp_y, exp_m, exp_d){
  var cookie_string = name + "=" + escape ( value );
  if(exp_y){
    var expires = new Date ( exp_y, exp_m, exp_d );
    cookie_string += "; expires=" + expires.toGMTString();
  }
  document.cookie = cookie_string;
}

function delete_cookie(name){
  var date = new Date ();
  date.setTime ( date.getTime() - 1 );
  document.cookie = name += "=; expires=" + date.toGMTString();
}

function ajax(){
	var xmlHttp;
	try{xmlHttp=new XMLHttpRequest();}// Firefox, Opera 8.0+, Safari
	catch (e){// Internet Explorer
		try{xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");}
		catch (e){
			try{xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");}
			catch (e){/*alert("Your browser does not support AJAX!");*/return false;}}}
	return xmlHttp;
}

function limit(field, countfield, maxlimit) {
	if (field.value.length > maxlimit)field.value = field.value.substring(0, maxlimit);
	else countfield.value = maxlimit - field.value.length;
}

function prefill(field,string){
   if(field.value == ''){
      field.value = string;
      field.style.color = '#777777';
   }
}

function empty(field,string){
   if(field.value == string){
      field.value = '';
      field.style.color = 'black';
   }
   return true;
}

function checkForm(field,prefill){
   if(field.value != ''){
      if(prefill != ''){
         if(field.value == prefill){
            alert('Musíte vyplnit pole formuláře');
            field.style.border = '1px solid red';
            field.focus();
            return false;
         }else{
            return true;
         }
      }else{
         return true;
      }
   }else{
      alert('Musíte vyplnit pole formuláře');
      field.style.border = '1px solid red';
      field.focus();
      return false;
   }
}

function checkDate(field, item){
   switch(item){
      case 'day':
         if(field.value >= 1 && field.value <= 31){
            return true;
         }else{
            alert('Hodnota mimo povolený rozsah (1-31)');
            field.style.border = '1px solid red';
            field.focus();
            return false;
         }
      break
      case 'month':
         if(field.value >= 1 && field.value <= 12){
            return true;
         }else{
            alert('Hodnota mimo povolený rozsah (1-12)');
            field.style.border = '1px solid red';
            field.focus();
            return false;
         }
      break
      case 'year':
         if(field.value >= 1900 && field.value <= 2100){
            return true;
         }else{
            alert('Hodnota mimo povolený rozsah (1900-2100)');
            field.style.border = '1px solid red';
            field.focus();
            return false;
         }
      break
      default:
         return true;
   }
}

function toggleDisplay(field){
   if(field.style.display=='none')
      field.style.display='block'
   else
      field.style.display='none'
}

function toggleClass(field,class1,class2){
   if(field.className==class1)
      field.className=class2
   else
      field.className=class1
}

function toggleValue(field){
   if(parseInt(field.value)==1)
      field.value=0;
   else
      field.value=1;
}

/*
function overpass(content){
  content.style.display = 'block';
  speed = 25;
  interval = 30;
  hide(speed,interval);
  //setTimeout("switchContent('"+content+"')",1000);
  setTimeout("show("+speed+","+interval+")",5000);
}

function hide(speed,interval){hInt = setInterval("moveUp('',"+speed+")",interval);}
function show(speed,interval){sInt = setInterval("moveDown('',"+speed+")",interval);}

var h1 = 0;
var h2 = 0;
var h3 = -210;
function moveUp(id,speed){
  document.getElementById('box_top').style.top = h2+'px';
  h2 -= speed;
  if(h2 <= h3){
    clearInterval(hInt);
    h2 = h3;
    document.getElementById('box_top').style.top = h2+'px';
  }
}

function moveDown(id,speed){
  document.getElementById('box_top').style.top = h2+'px';
  h2 += speed;
  if(h2 >= h1){
    clearInterval(sInt);
    h2 = h1;
    document.getElementById('box_top').style.top = h2+'px';
  }
}
*/