var m0;
var y0;
function calendar(field,calid, d, m, y){
//alert(d);
//alert (m0);
	var mn =['Gennaio','Febbraio','Marzo','Aprile','Maggio','Giugno','Luglio','Agosto','Settembre','Ottobre','Novembre','Dicembre'];
	var dim =[31,0,31,30,31,30,31,31,30,31,30,31];

	var vDay = new Date(y, m-1, 1);
	var nowDate = new Date(y, m-1, d);
	var gp = nowDate.getDate();
	vDay.d=vDay.getDay()+7; 

	var vToday = new Date();
	var findDay = (y==vToday.getFullYear() && m==vToday.getMonth()+1)? vToday.getDate() : 0;
	var dateString = '\''+rtrn2chr(gp)+'/'+rtrn2chr(vDay.getMonth())+'/'+vDay.getFullYear()+'\'';
	dim[1]=(((vDay.getFullYear()%100!=0)&&(vDay.getFullYear()%4==0))||(vDay.getFullYear()%400==0))?29:28;
	var t='<div class="CDefault"><table class="CDefault" cols="8" cellpadding="1" border="0" cellspacing="1">';
	t+= '<tr align="center"><td align="center" class="CLabel"><span onclick="writeCalendar(0,\''+field+'\',\''+calid+'\', '+dateString+',0,-1);" style="cursor:hand;">\u00AB</span></td>'
	t+= '<td colspan="6" align="center" class="CLabel">'+mn[m-1]+'</td>';
	t+= '<td align="center" class="CLabel"><span onclick="writeCalendar(0,\''+field+'\',\''+calid+'\','+dateString+',0,1);" style="cursor:hand;">\u00BB</span></td></tr>'
	t+= '<tr align="center"><td align="center" class="CLabel"><span onclick="writeCalendar(0,\''+field+'\',\''+calid+'\','+dateString+',-1,0);" style="cursor:hand;">\u00AB</span></td>'
	t+= '<td colspan="6" align="center" class="CLabel">'+y+'</td>';	
	t+= '<td align="center" class="CLabel"><span onclick="writeCalendar(0,\''+field+'\',\''+calid+'\','+dateString+',1,0);" style="cursor:hand;">\u00BB</span></td></tr>';
	t+= '<tr align="center">';
	for(s=0;s<8;s++){
		t+='<td class="CLabel">'+" LMMGVSD".substr(s,1)+'</td>';
	}
	var wy = weekOfYear(vDay.getFullYear(),vDay.getMonth(),1);
	t+='</tr><tr align="center"><td class="CWeek">'+wy+'</td>';
	var p_t = (vDay.d>7) ? eval(vDay.d-7) : vDay.d;
	for(s=p_t-1;s>0;s--){
		dayPrev = (m<=1) ? eval(31-s+1) : eval(dim[m-2]-s+1);
		t += '<td class="CDayBg">'+dayPrev+'</td>';
	}
	var ats=0;
	for(i=1;i<=dim[m-1];i++){
		ats++;
		var cls='CDay';
		if(gp==i && nowDate.getMonth()+1==m0 && nowDate.getFullYear()==y0){cls='CselDay';}
		if (isNaN(d) && i==findDay){cls='CselDay';}
		t += '<td class="'+cls+'">';
		t += '<span onclick="document.getElementById(\'' + field + '\').value=\''+rtrn2chr(i)+'/'+rtrn2chr(vDay.getMonth()+1)+'/'+vDay.getFullYear()+'\';document.getElementById(\''+calid+'\').style.visibility=\'hidden\';" style="cursor:hand;visHide(1,\''+calid+'\');">'+i+'</span></td>';
		if((p_t+i-1)%7==0){
			wy+=1;
			t+='</tr>';
			if(i>(p_t+i-11)&&i!=dim[m-1]){t+='<tr><td class="CWeek">'+wy+'</td>';ats=0;}
		}
	}
	for(s=1;s<8-ats;s++){
		t += '<td class="CDayBg">'+s+'</td>';
	}
	t+='</table></div>';
	return t;
}
function visHide(t,calid){
	var dis = document.getElementById(calid).style;
	if(dis.visibility=='hidden'){dis.visibility='visible';return true;}
	else{if(t==1){dis.visibility='hidden';return false;}else{return true;}}
}
function writeCalendar(t, field, calid, ymd, yy, mm){
	y = parseInt(ymd.substr(6,4),10);
	m = parseInt(ymd.substr(3,2),10)
	g = parseInt(ymd.substr(0,2),10);
	
	if(visHide(t,calid)){
		if(t==1){if(isNaN(yy) && isNaN(m)){var vToday=new Date();}else{var vToday=new Date(y,m-1,1);}}
		else{var vToday=new Date(y,m,1);}
		if(yy){
			if(t==1){vToday.setFullYear(y,m-1)}else{vToday.setFullYear(y+yy,m+mm);}
		}
		else if(mm){
			if(t==1){vToday.setMonth(m-1)}else{vToday.setMonth(m+mm);}
		}
		var vMonth=vToday.getMonth()+1;
		var vYear=vToday.getFullYear();
		if(event.srcElement.src!=undefined){m0 = vMonth;	y0 = vYear;}
		document.getElementById(calid).innerHTML = calendar(field, calid, g, vMonth ,vYear);
		document.getElementById(calid).setActive();
	}
}
function weekOfYear(yyear,mmonth,dday){
	var d = new Date(yyear, mmonth, dday, 0, 0, 0);
	var DoW = d.getDay(); //day of the week 0=Sun 6=Sat
	d.setDate(d.getDate() - (DoW + 6) % 7+7);
	var myVar = d.valueOf();
	d.setMonth(0);	d.setDate(5);
	return (Math.round((myVar - d.valueOf()) / (7 * 864e5)) + 1);
}
function rtrn2chr(num){
	num = "0"+num;
	return Right(num,2)
}
function Right(str, n){
    if (n <= 0)
       return "";
    else if (n > String(str).length)
       return str;
    else {
       var iLen = String(str).length;
       return String(str).substring(iLen, iLen - n);
    }
}