function getById(id) {
  if (document.getElementById)
    var returnVar = document.getElementById(id);
  else if (document.all)
    var returnVar = document.all[id];
  else if (document.layers)
    var returnVar = document.layers[id];
  return returnVar;
}
function getSize() {
  var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
    myHeight = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myHeight = document.body.clientHeight;
  }
	return [myWidth,myHeight];
}
function getScrollXY() {
	var scrOfX = 0, scrOfY = 0;
	if( typeof( window.pageYOffset ) == 'number' ) {
		scrOfY = window.pageYOffset; scrOfX = window.pageXOffset;
	} else if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) {
		scrOfY = document.body.scrollTop; scrOfX = document.body.scrollLeft;
	} else if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) {
		scrOfY = document.documentElement.scrollTop; scrOfX = document.documentElement.scrollLeft;
	}
	window.alert( 'Horizontal scrolling = ' + scrOfX + '\nVertical scrolling = ' + scrOfY );
}
function daysInMonth(month,year) {
	
	var m = [31,28,31,30,31,30,31,31,30,31,30,31];
	if (month != 2) return m[month - 1];
	if (year%4 != 0) return m[1];
	if (year%100 == 0 && year%400 != 0) return m[1];

	return m[1] + 1;
}
function rebuild_date_select(name_rok,name_dzien,name_mc)
{
	var month=daysInMonth(getById(String(name_mc)).value,getById(String(name_rok)).value); 
	var days=getById(String(name_dzien));
	var old_d=days.selectedIndex;
		if(days.childNodes.length!=month)
		{
			while (days.firstChild)days.removeChild(days.firstChild);
		
			for(var i=1;i<=month;i++)
			{
				days.options.add(new Option(i,i));
			}
		
		}
	try {
		days.selectedIndex=old_d;
	}catch(err)
	{
		
	}
	
}
function tabbed_menu(name,index,max)
{
	for(var i=1;i<=max;i++)
	{
		if(i!=index)
		{
			getById(name+String(i)).className="krok_off";
			getById("div_"+name+String(i)).style.display="none";
		}
		else
		{
			getById(name+String(i)).className="krok_on";		
			getById("div_"+name+String(i)).style.display="block";
		}		
	}
}