var date_arr = new Array;
var days_arr = new Array;

date_arr[0]=new Option("enero",31);
date_arr[1]=new Option("febrero",28);
date_arr[2]=new Option("marzo",31);
date_arr[3]=new Option("abril",30);
date_arr[4]=new Option("mayo",31);
date_arr[5]=new Option("junio",30);
date_arr[6]=new Option("julio",31);
date_arr[7]=new Option("agosto",31);
date_arr[8]=new Option("septiembre",30);
date_arr[9]=new Option("octubre",31);
date_arr[10]=new Option("noviembre",30);
date_arr[11]=new Option("diciembre",31);

var e_days_arr = days_arr;

function leapYear(year) { 
	return (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) ? 1 : 0;
}

function fill_select(f)

{

        document.writeln("<SELECT name=\"months\" onchange=\"update_days(FRM);assessForm(FRM);\">");

        for(x=0;x<12;x++) 

                document.writeln("<OPTION value=\""+x+"\">"+date_arr[x].text);

        document.writeln("</SELECT><SELECT name=\"days\" onchange=\"assessForm(FRM)\"></SELECT>");

        selection=f.months[f.months.selectedIndex].value;

}



function update_days(f)

{

        temp=f.days.selectedIndex; 

        for(x=days_arr.length;x>0;x--)

        {

                days_arr[x]=null;

                f.days.options[x]=null;

         }

        selection=parseInt(f.months[f.months.selectedIndex].value);

        ret_val = 0;

				// february?
        if (selection == 1)

        {

                year=parseInt(f.years.options[f.years.selectedIndex].value);
								
								daycount = 29;
								
								if (!leapYear(year)) daycount = 28;

        } else {
					daycount = date_arr[selection].value;
				}

        for(x=0;x < daycount;x++) 
        {

                days_arr[x]=new Option(x+1, x+1);            

                f.days.options[x]=days_arr[x];

        }

        if (temp == -1) f.days.options[0].selected=true;

        else {
						 if (temp > (daycount-1)) {
							 temp = daycount-1;
						 }

             f.days.options[temp].selected=true;  
				}
}       

function year_install(f)

{
				var time=new Date();
				var year=time.getYear();
				if (year < 2000) {
			  	year = year + 1900;
				}
				
        document.writeln("<SELECT name=\"years\" onchange=\"update_days(FRM);assessForm(FRM)\">")

        for(x=year;x<(year+5);x++) document.writeln("<OPTION value=\""+x+"\">"+x);

        document.writeln("</SELECT>");

        update_days(f)

}

// Quick extra functions to work with date range

function e_fill_select(f)

{

        document.writeln("<SELECT name=\"e_months\" onchange=\"e_update_days(FRM);assessForm(FRM);\">");

        for(x=0;x<12;x++) 

                document.writeln("<OPTION value=\""+x+"\">"+date_arr[x].text);

        document.writeln("</SELECT><SELECT name=\"e_days\" onchange=\"assessForm(FRM)\"></SELECT>");

        selection=f.e_months[f.e_months.selectedIndex].value;

}



function e_update_days(f)

{

        temp=f.e_days.selectedIndex; 

        for(x=e_days_arr.length;x>0;x--)

        {

                e_days_arr[x]=null;

                f.e_days.options[x]=null;

         }

        selection=parseInt(f.e_months[f.e_months.selectedIndex].value);
				
        ret_val = 0;
				
				// february?
        if (selection == 1)

        {

                year=parseInt(f.e_years.options[f.e_years.selectedIndex].value);

								daycount = 29;
								
								if (!leapYear(year)) daycount = 28;

        } else {
					daycount = date_arr[selection].value;
				}
				

        for(x=0;x < daycount;x++) 
        {

                e_days_arr[x]=new Option(x+1, x+1);            

                f.e_days.options[x]=e_days_arr[x];

        }

        if (temp == -1) f.e_days.options[0].selected=true;

        else {
						 if (temp > (daycount-1)) {
							 temp = daycount-1;
						 }

             f.e_days.options[temp].selected=true;  
				}
}       

function e_year_install(f)

{
				var time=new Date();
				var year=time.getYear();
				if (year < 2000) {
			  	year = year + 1900;
				}
				
        document.writeln("<SELECT name=\"e_years\" onchange=\"e_update_days(FRM);assessForm(FRM)\">")

        for(x=year;x<(year+5);x++) document.writeln("<OPTION value=\""+x+"\">"+x);

        document.writeln("</SELECT>");

        e_update_days(f)

}