function checkbox_js (the_id) {
   if (document.form.elements[the_id].checked == true) {
      document.form.elements[the_id].checked = false;
   }else {
      document.form.elements[the_id].checked = true;
   }
}
function inarray (value,array) {
   for(var key in array){
      if(array[key]==value) {
         return key;
      }
   }
}
function tostring (pole,oddelovac) {
   string = "";
   for (var key in pole) { 
      if(pole[key]!="") {string += pole[key]+oddelovac;}
   }
   return string;
}
function tosource (array) {
   string="";
   carka="";
   for (var key in array) { 
      string += carka+"\""+array[key]+"\"";
      carka=",";
   }
   return string;
}
function dates (datum) {
   if(datum) {
      i = inarray(datum,pole)
      if (i || i==="0") {
         pole.splice(i,1);
      }
      else {
         pole[pole.length]=datum;
      }
   }
   paste_to_textarea(tostring(pole,'\n'));
   str=tosource(pole);
   document.forms["kalendar1"].elements["hidden"].value=str;
   document.forms["kalendar2"].elements["hidden"].value=str;
   document.forms["formular"].elements["hidden"].value=str;
}
function paste_to_textarea(strinL){ 
var input=document.forms["formular"].elements["terminy"];
input.value=strinL; 
}