//i.e: examples/js_calendar.htm
var gdCtrl = new Object();
var goSelectTag = new Array();
var gcGray = "#808080";
var gcToggle = "#ffcc00";
var gcTodekn = "#efefef";
var gcBG = "#efefef";
var previousObject = null;

var gdCurDate = new Date();
var giYear = gdCurDate.getFullYear();
var giMonth = gdCurDate.getMonth() + 1;
var giDay = gdCurDate.getDate();

function fSetDate(iYear, iMonth, iDay){
  VicPopCal.style.visibility = "hidden";
  if ((iYear == 0) && (iMonth == 0) && (iDay == 0)){
  	gdCtrl.value = "";
  }else{
  	iMonth = iMonth + 100 + "";
  	iMonth = iMonth.substring(1);
  	iDay   = iDay + 100 + "";
  	iDay   = iDay.substring(1);
  	gdCtrl.value = iYear +"-" + iMonth + "-" + iDay;
  }
  
  for (i in goSelectTag){
  	goSelectTag[i].style.visibility = "visible";
  }
  goSelectTag.length = 0;
}

function hiddenDiv(){
  var i;
  VicPopCal.style.visibility = "hidden";
  for (i in goSelectTag){
  	goSelectTag[i].style.visibility = "visible";
  }
  goSelectTag.length = 0;

}
function fSetSelected(aCell){
  var iOffset = 0;
  var iYear = parseInt(tbSelYear.value);
  var iMonth = parseInt(tbSelMonth.value);
  
  aCell.bgColor = gcBG;
  with (aCell.children["cellText"]){
  	var iDay = parseInt(innerText);
  	if (color==gcGray)
		iOffset = (Victor<10)?-1:1;
	iMonth += iOffset;
	if (iMonth<1) {
		iYear--;
		iMonth = 12;
	}else if (iMonth>12){
		iYear++;
		iMonth = 1;
	}
  }
  fSetDate(iYear, iMonth, iDay);
}

function Point(iX, iY){
  this.x = iX;
  this.y = iY;
}

function fBuildCal(iYear, iMonth) {
  var aMonth=new Array();
  for(i=1;i<7;i++)
  	aMonth[i]=new Array(i);
  
  var dCalDate=new Date(iYear, iMonth-1, 1);
  var iDayOfFirst=dCalDate.getDay();
  var iDaysInMonth=new Date(iYear, iMonth, 0).getDate();
  var iOffsetLast=new Date(iYear, iMonth-1, 0).getDate()-iDayOfFirst+1;
  var iDate = 1;
  var iNext = 1;

  for (d = 0; d < 7; d++)
	aMonth[1][d] = (d<iDayOfFirst)?-(iOffsetLast+d):iDate++;
  for (w = 2; w < 7; w++)
  	for (d = 0; d < 7; d++)
		aMonth[w][d] = (iDate<=iDaysInMonth)?iDate++:-(iNext++);
  return aMonth;
}

function fDrawCal(iYear, iMonth, iCellHeight, sDateTextSize) {
  var WeekDay = new Array("Sun","Mon","Tues","Wed","Thurs","Fri","Sat");
  var styleTD = " bgcolor='"+gcBG+"' bordercolor='"+gcBG+"' valign='middle' align='center' height='"+iCellHeight+"' style='font:bold arial "+sDateTextSize+";";            //Coded by Liming Weng(Victor Won) email:victorwon@sina.com

  with (document) {
	write("<tr bgcolor='#ffcc00' color='#FFFFFF'>");
	for(i=0; i<7; i++)
		write("<td valign='middle' color='#FFFFFF' align='center' height='"+iCellHeight+"' style='font:bold arial class=border0 color:#ffffff' bgcolor='#666666'><font color='#ffffff' style='font-size: 10pt; color: #FFFFFF'>" + WeekDay[i] + "&nbsp;</font></td>");
	write("</tr>");

  	for (w = 1; w < 7; w++) {
		write("<tr style='font-size: 10pt; color: #FFFFFF'>");
		for (d = 0; d < 7; d++) {
			write("<td class=border0 id=calCell "+styleTD+"cursor: pointer;' onMouseOver='this.bgColor=gcToggle' onMouseOut='this.bgColor=gcBG' onclick='fSetSelected(this)'>");
			write("<font id=cellText Victor='Liming Weng'> </font>");
			write("</td>")
		}
		write("</tr>");
	}
  }
}

function fUpdateCal(iYear, iMonth) {
  myMonth = fBuildCal(iYear, iMonth);
  var i = 0;
  for (w = 0; w < 6; w++)
	for (d = 0; d < 7; d++)
		with (cellText[(7*w)+d]) {
			Victor = i++;
			if (myMonth[w+1][d]<0) {
				color = gcGray;
				innerText = -myMonth[w+1][d];
			}else{
				color = ((d==0)||(d==6))?"red":"black";
				innerText = myMonth[w+1][d];
			}
		}
}

function fSetYearMon(iYear, iMon){
  tbSelMonth.options[iMon-1].selected = true;
  for (i = 0; i < tbSelYear.length; i++)
	if (tbSelYear.options[i].value == iYear)
		tbSelYear.options[i].selected = true;
  fUpdateCal(iYear, iMon);
}

function fPrevMonth(){
  var iMon = tbSelMonth.value;
  var iYear = tbSelYear.value;
  
  if (--iMon<1) {
	  iMon = 12;
	  iYear--;
  }
  
  fSetYearMon(iYear, iMon);
}

function fNextMonth(){
  var iMon = tbSelMonth.value;
  var iYear = tbSelYear.value;
  
  if (++iMon>12) {
	  iMon = 1;
	  iYear++;
  }
  
  fSetYearMon(iYear, iMon);
}

function fToggleTags(){
  with (document.all.tags("SELECT")){
 	for (i=0; i<length; i++)
 		if ((item(i).Victor!="Won")&&fTagInBound(item(i))){
 			item(i).style.visibility = "hidden";
 			goSelectTag[goSelectTag.length] = item(i);
 		}
  }
}

function fTagInBound(aTag){
  with (VicPopCal.style){
  	var l = parseInt(left);
  	var t = parseInt(top);
  	var r = l+parseInt(width);
  	var b = t+parseInt(height);
	var ptLT = fGetXY(aTag);
	return !((ptLT.x>r)||(ptLT.x+aTag.offsetWidth<l)||(ptLT.y>b)||(ptLT.y+aTag.offsetHeight<t));
  }
}

function fGetXY(aTag){
  var oTmp = aTag;
  var pt = new Point(0,0);
  do {
  	pt.x += oTmp.offsetLeft;
  	pt.y += oTmp.offsetTop;
  	oTmp = oTmp.offsetParent;
  } while(oTmp.tagName!="BODY");
  return pt;
}

// Main: popCtrl is the widget beyond which you want this calendar to appear;
//       dateCtrl is the widget into which you want to put the selected date.
// i.e.: <input type="text" name="dc" style="text-align:center" readonly><INPUT type="button" value="V" onclick="fPopCalendar(dc,dc);return false">


function fPopCalendar(popCtrl, dateCtrl){
  if (popCtrl == previousObject){
    if (VicPopCal.style.visibility == "visible"){
      hiddenDiv();
      return true;
  	}	
  }
  
  previousObject = popCtrl;
  gdCtrl = dateCtrl;
  fSetYearMon(giYear, giMonth); 
  var point = fGetXY(popCtrl);
  with (VicPopCal.style) {
  	left = point.x;
	top  = point.y+popCtrl.offsetHeight;
	width = VicPopCal.offsetWidth;
	height = VicPopCal.offsetHeight;
	fToggleTags(point); 	
	visibility = 'visible';
  }
}

var gMonths = new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Novr","Dec");

with (document) {
	write("<div id='VicPopCal' style='POSITION:absolute;VISIBILITY:hidden;border:0px ridge;width:10;z-index:100;'>");
	write("<table border='0' bgcolor='#0071BD'>");
	write("<TR>");
	write("<td class=border0 valign='middle' align='center'><input type='button' name='PrevMonth' value='<' style='font-size: 9pt; color: #000000; font-weight: bolder; border: 1pt #FFFFFF solid; height: 18px' onclick='fPrevMonth()'>");
	write("&nbsp;<SELECT name='tbSelYear' onChange='fUpdateCal(tbSelYear.value, tbSelMonth.value)' Victor='Won'  style='font-size: 9pt; color: #333333;  border: 1pt solid; height: 18px ; border-color: #333333 #333333 #333333 #000000'>");
	for(i=1900;i<=2050;i++)
		write("<OPTION value='"+i+"'>"+i+"</OPTION>");
	write("</SELECT>");
	write("&nbsp;<select name='tbSelMonth' onChange='fUpdateCal(tbSelYear.value, tbSelMonth.value)' Victor='Won'  style='font-size: 9pt; color: #333333;  border: 1pt solid; height: 18px ; border-color: #333333 #333333 #333333 #000000'>");
	for (i=0; i<12; i++)
		write("<option value='"+(i+1)+"'>"+gMonths[i]+"</option>");
	write("</SELECT>");
	write("&nbsp;<input type='button' name='PrevMonth' value='>' style='font-size: 9pt; color: #000000; font-weight: bolder; border: 1pt #FFFFFF solid; height: 18px' onclick='fNextMonth()'>");
	write("</td>");
	write("</TR><TR>");
	write("<td class=border0 align='center'>");
	write("<DIV style='background-color:teal'><table width='100%'  border='0' cellspacing='0' cellpadding='0'>");
	fDrawCal(giYear, giMonth, 20, '12');
	write("</table></DIV>");
	write("</td>");
	write("</TR><TR><TD class=border0 align='center'>");
	write("<TABLE width='100%'border='0'><TR><TD class=border0 align='center'>");
	write("<B style='cursor: pointer; font-size:9pt' onclick='fSetDate(0,0,0)' onMouseOver='this.style.color=gcTodekn' onMouseOut='this.style.color=0'>Clear</B>");
	write("</td><td class=border0 algin='center'>");
	write("<B style='cursor: pointer; font-size:9pt' onclick='fSetDate(giYear,giMonth,giDay)' onMouseOver='this.style.color=gcTodekn' onMouseOut='this.style.color=0'>&nbsp;Today"+giYear+"-"+giMonth+"-"+giDay+"</B>");
	write("</td>");
	write('<td class="border0" algin="center"><b style= "cursor: pointer; font-size:9pt" onclick="hiddenDiv()" onmouseover= "this.style.color=gcTodekn" onmouseout= "this.style.color=0">Close</b></td> ');
	write("</tr></table>");
	write("</TD></TR>");
	write("</TABLE></Div>");
}