function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") &&
       anchor.getAttribute("rel") == "external")
     anchor.target = "_blank";
 }

}

function openWindow(path, name, width, height) {
     var winl = (screen.width - width) / 2;
     var wint = (screen.height - height) / 2;
     style = eval("'status=no,width="+width+",height="+height+",left="+winl+",top="+wint+",resizable=yes,menubar=no,scrollbars=yes,toolbar=no'");
     window.open(path, name, style) ;
}

function openWindowE(path, name, width, height) {
     var winl = (screen.width - width) / 2;
     var wint = (screen.height - height) / 2;
     style = eval("'status=no,width="+width+",height="+height+",left="+winl+",top="+wint+",resizable=yes,menubar=no,scrollbars=no,toolbar=no'");
     window.open(path, name, style) ;
}

function openWindowFeratel(path, name, width, height) {
     var winl = (screen.width - width) / 2;
     var wint = (screen.height - height) / 2;
     style = eval("'status=yes,width="+width+",height="+height+",left="+winl+",top="+wint+",resizable=yes,menubar=no,scrollbars=no,toolbar=yes'");
     return window.open(path, name, style) ;
}



function validateForm(form) {

     win = openWindowFeratel("http://www.janskelazne.cz/feratel/","feratel",850,650);
     win.focus();

     var s = form.SrchFromMY.value.split("|");

     form.SrchFromMonth.value = s[0];
     form.SrchFromYear.value = s[1];

     var d = parseInt( form.SrchFromDay.value )
     var m = parseInt( form.SrchFromMonth.value )
     var j = parseInt( form.SrchFromYear.value )

     if ( !checkDate(d,m,j) ) {
          alert("Chybné datum příjezdu!") ;
          form.SrchFromDay.focus();
          return false;
     }
}

function checkDate( d, m, j ) {
          var dt = new Date( j, m-1, d )
          if ( dt.getDate() != d || dt.getMonth()+1 != m ) return false;
          return true;
}