var picWindow= "";
function newPicWin(pic,w,h,s){
  if (picWindow == "" || picWindow.closed) {
      picWindow = window.open("","","status,height="+h+",width="+w+",resizable,scrollbars=YES")
      picWindow.name="picWin";
    // assemble content for new window
    }
    picWindow.location.href='picDetail.php?pic='+pic;
    picWindow.focus();
}


function checkCourseDate(d){
   re = /(\d+).(\d+).(\d+)/;
   a = re.exec(d);
   if(a==null){
     alert('Vložte správné datum.');
     return false;
   }
   d = new Date(a[3],a[2],a[1]);
   ted= new Date();
   if(d<ted){
     alert('Datum nemůže být v minulosti');
     return false;
   }
   return true;
}
//will open window for prihlaska to print
function printPrihlaska(co){


}