function changeSearchTarget(target) {

  var sb_array = new Array();
  sb_array[0] = "tlKatalog";
  sb_array[1] = "tlClanky";
  sb_array[2] = "tlICQseznam";
  sb_array[3] = "tlTexty";
  sb_array[4] = "TlGoogle";

  var sb_form_array = new Array();
  sb_form_array[0] = "foKatalog";
  sb_form_array[1] = "foClanky";
  sb_form_array[2] = "foICQseznam";
  sb_form_array[3] = "foTexty";
  sb_form_array[4] = "foGoogle";
  
  var temp_s = 0;
  var temp_string = '';

  var i = 0;
  for(i = 0; i < sb_array.length; i++) {
    document.getElementById(sb_array[i]).className = "searchBoxUnselected";
  }

  for(i = 0; i < sb_form_array.length; i++) {
  	if(document.getElementById(sb_form_array[i]).style.display == "block")
  	  temp_s = i;
  }

  switch(target) {
      case 'katalog':
      	  document.getElementById(sb_form_array[temp_s]).style.display = "none";
          document.getElementById(sb_array[0]).className = "searchBoxSelected";
      	  document.getElementById(sb_form_array[0]).style.display = "block";    	  
      break;
      case 'clanky':
      	  document.getElementById(sb_form_array[temp_s]).style.display = "none";
          document.getElementById(sb_array[1]).className = "searchBoxSelected";
      	  document.getElementById(sb_form_array[1]).style.display = "block";    	  
      break;
      case 'icqseznam':
      	  document.getElementById(sb_form_array[temp_s]).style.display = "none";
          document.getElementById(sb_array[2]).className = "searchBoxSelected";
      	  document.getElementById(sb_form_array[2]).style.display = "block";    	  
      break;
      case 'texty':
      	  document.getElementById(sb_form_array[temp_s]).style.display = "none";
          document.getElementById(sb_array[3]).className = "searchBoxSelected";
      	  document.getElementById(sb_form_array[3]).style.display = "block";
      break;
      case 'google':
      	  document.getElementById(sb_form_array[temp_s]).style.display = "none";
          document.getElementById(sb_array[4]).className = "searchBoxSelected";
      	  document.getElementById(sb_form_array[4]).style.display = "block";
      break; 
    }
}