function getObj(objID) {
 if (document.getElementById) {return document.getElementById(objID);}
 else if (document.all) {return document.all[objID];}
 else if (document.layers) {return document.layers[objID];}
}

function checkClick(e) {
	e?evt=e:evt=event;
	CSE=evt.target?evt.target:evt.srcElement;
	if (getObj('fc'))
		if (!isChild(CSE,getObj('fc')))
			getObj('fc').style.display='none';
}

function isChild(s,d) {
	while(s) {
		if (s==d) 
			return true;
		s=s.parentNode;
	}
	return false;
}

function Left(obj) {
	var curleft = 0;
	if (obj.offsetParent)
	{
		while (obj.offsetParent)
		{
			curleft += obj.offsetLeft
			obj = obj.offsetParent;
		}
	}
	else if (obj.x)
		curleft += obj.x;
	return curleft;
}

function Top(obj) {
	var curtop = 0;
	if (obj.offsetParent)
	{
		while (obj.offsetParent)
		{
			curtop += obj.offsetTop
			obj = obj.offsetParent;
		}
	}
	else if (obj.y)
		curtop += obj.y;
	return curtop;
}


// Calendar script
var now = new Date;
var sccm=now.getMonth();
var sccy=now.getFullYear();
var ccm=now.getMonth();
var ccy=now.getFullYear();
var updobj;

function lcs(ielem) {
	updobj=ielem;
	getObj('fc').style.left=Left(ielem);
	getObj('fc').style.top=Top(ielem)+ielem.offsetHeight;
	getObj('fc').style.display='';
	
	// First check date is valid
	curdt=ielem.value;
	curdtarr=curdt.split('.');
	isdt=true;
	for(var k=0;k<curdtarr.length;k++) {
		if (isNaN(curdtarr[k]))
			isdt=false;
	}
	if (isdt&(curdtarr.length==3)) {
		ccm=curdtarr[1]-1;
		ccy=curdtarr[2];
		prepcalendar(curdtarr[0],curdtarr[1]-1,curdtarr[2]);
	}
	
}

function evtTgt(e) {
	var el;
	if(e.target)el=e.target;
	else if(e.srcElement)el=e.srcElement;
	if(el.nodeType==3)el=el.parentNode; // defeat Safari bug
	return el;
}

function EvtObj(e) {
 if(!e)e=window.event;
 return e;
}

function cs_over(e) {
	evtTgt(EvtObj(e)).style.background='#FFCC66';
}

function cs_out(e) {
	evtTgt(EvtObj(e)).style.background='#C4D3EA';
}

function cs_click(e) {
	updobj.value=calvalarr[evtTgt(EvtObj(e)).id.substring(1,evtTgt(EvtObj(e)).id.length)];
	getObj('fc').style.display='none';
}

//var mn=new Array('leden','únor','březen','duben','květen','červen','červenec','srpen','září','říjen','listopad','prosinec');
var mn=new Array('January','February','March','April','May','June','July','August','September','October','November','December');
var mnn=new Array('31','28','31','30','31','30','31','31','30','31','30','31');
var mnl=new Array('31','29','31','30','31','30','31','31','30','31','30','31');
var calvalarr=new Array(42);

function f_cps(obj) {
	obj.style.background='#C4D3EA';
	obj.style.font='10px Arial';
	obj.style.color='#333333';
	obj.style.textAlign='center';
	obj.style.textDecoration='none';
	obj.style.border='1px solid #6487AE';
	obj.style.cursor='pointer';
}

Date.prototype.getWeek = function() {
var onejan = new Date(this.getFullYear(),0,1);
return Math.ceil((((this - onejan) / 86400000) + onejan.getDay())/7);
}

document.write('<table id="fc" style="position:absolute;border-collapse:collapse;background:#FFFFFF;border:1px solid #ABABAB;display:none" cellpadding=2>');
document.write('<tr><td style="cursor:pointer" onclick="csubm()"><img src="img/arrowleftmonth.gif"></td><td colspan=6 id="mns" align="center" style="font:bold 13px Arial"></td><td align="right" style="cursor:pointer" onclick="caddm()"><img src="img/arrowrightmonth.gif"></td></tr>');
//document.write('<tr><td align=center style="background:#ABABAB;font:12px Arial">T</td><td align=center style="background:#ABABAB;font:12px Arial">Po</td><td align=center style="background:#ABABAB;font:12px Arial">Ut</td><td align=center style="background:#ABABAB;font:12px Arial">St</td><td align=center style="background:#ABABAB;font:12px Arial">Ct</td><td align=center style="background:#ABABAB;font:12px Arial">Pa</td><td align=center style="background:#ABABAB;font:12px Arial">So</td><td align=center style="background:#ABABAB;font:12px Arial">Ne</td></tr>');
document.write('<tr><td align=center style="background:#ABABAB;font:12px Arial">W</td><td align=center style="background:#ABABAB;font:12px Arial">Mo</td><td align=center style="background:#ABABAB;font:12px Arial">Tu</td><td align=center style="background:#ABABAB;font:12px Arial">We</td><td align=center style="background:#ABABAB;font:12px Arial">Th</td><td align=center style="background:#ABABAB;font:12px Arial">Fr</td><td align=center style="background:#ABABAB;font:12px Arial">Sa</td><td align=center style="background:#ABABAB;font:12px Arial">Su</td></tr>');
for(var kk=1;kk<=6;kk++) {
	document.write('<tr><td  id="w' + kk + '" style="background:#ABABAB;font:12px Arial"></td>');
	for(var tt=1;tt<=7;tt++) {
		num=7 * (kk-1) - (-tt);
		document.write('<td id="v' + num + '" style="width:18px;height:18px">' + num +'</td>');
	}
	document.write('</tr>');
}
document.write('</table>');

document.all?document.attachEvent('onclick',checkClick):document.addEventListener('click',checkClick,false);


// day selected
function prepcalendar(hd,cm,cy) {
	now=new Date();
	sd=now.getDate();
	td=new Date();
	td.setDate(7);
	td.setFullYear(cy);
	td.setMonth(cm);
	cd=td.getDay();
	getObj('mns').innerHTML=mn[cm]+ ' ' + cy;
	marr=((cy%4)==0)?mnl:mnn;
 var ww = 1;
 for(var y=1;y<=6;y++) {
 var datum = new Date(cy,cm,ww);
 var weekno = datum.getWeek();
  getObj('w'+parseInt(y)).innerHTML=weekno;
 ww=ww+7
 }
	for(var d=1;d<=42;d++) {
		f_cps(getObj('v'+parseInt(d)));
		if ((d >= (cd -(-1))) && (d<=cd-(-marr[cm]))) {
			htd=((hd!='')&&(d-cd==hd));
			f_cps(getObj('v'+parseInt(d)));

			getObj('v'+parseInt(d)).onmouseover=cs_over;
			getObj('v'+parseInt(d)).onmouseout=cs_out;
			getObj('v'+parseInt(d)).onclick=cs_click;
			
			getObj('v'+parseInt(d)).innerHTML=d-cd;	
			calvalarr[d]=''+(d-cd)+'.'+(cm-(-1))+'.'+cy;
		}
		else {
			getObj('v'+d).innerHTML='&nbsp;';
			getObj('v'+parseInt(d)).onmouseover=null;
			getObj('v'+parseInt(d)).onmouseout=null;
			getObj('v'+parseInt(d)).style.cursor='default';
			}
	}
}

prepcalendar('',ccm,ccy);

function caddm() {
	marr=((ccy%4)==0)?mnl:mnn;
	ccm+=1;
	if (ccm>=12) {
		ccm=0;
		ccy++;
	}
	prepcalendar('',ccm,ccy);
}

function csubm() {
	marr=((ccy%4)==0)?mnl:mnn;
	ccm-=1;
	if (ccm<=-1) {
		ccm=11;
		ccy--;
	}
	prepcalendar('',ccm,ccy);
}