function setDate(str) {

 if (str == "   ") {
  return;
 }

 mnth1 = document.forms[0].month.value;
 mnth = mnth1;
 mnth++;
 year = document.forms[0].year.value;
 dateStr = mnth+"/"+str+"/"+year;

 dateStr = trim(dateStr);
 
 document.forms[1].dateField.value = dateStr;


}//setDate()

/**
 * The function removes spaces from the selected date.
 */

function trim(str) {

 res="";

 for(var i=0; i< str.length; i++) {
   if (str.charAt(i) != " ") {
     res +=str.charAt(i);
  }
 }
   
 return res;

}//trim()
 
/**
 * The method to get the Month name given the Month number of the year.
 */

function getMonthName(mnth) {

 if (mnth == 0) {
  name = "Enero";
 }else if(mnth==1) {
  name = "Febrero";
 }else if(mnth==2) {
  name = "Marzo";
 }else if(mnth==3) {
  name = "Abril";
 }else if(mnth==4) {
  name = "Mayo";
 } else if(mnth==5) {
  name = "Junio";
 } else if(mnth==6) {
  name = "Julio";
 } else if(mnth==7) {
  name = "Agosto";
 } else if(mnth==8) {
  name = "Setiembre";
 } else if(mnth==9) {
  name = "Octubre";
 } else if(mnth==10) {
  name = "Noviembre";
 } else if(mnth==11) {
  name = "Diciembre";
 }

 return name;

}//getMonthName()

/**
 * Get the number of days in the month based on the year.
 */

function getNoOfDaysInMnth(mnth,yr) {
 
 rem = yr % 4;

 if(rem ==0) {
   leap = 1;
 } else {
  leap = 0;
 }

 noDays=0;

 if ( (mnth == 1) || (mnth == 3) || (mnth == 5) ||
      (mnth == 7) || (mnth == 8) || (mnth == 10) ||
      (mnth == 12)) {
  noDays=31;
 } else if (mnth == 2) {
           noDays=28+leap;
        } else {
           noDays=30;
 }

 //alert(noDays);
 return noDays;
 
      
}//getNoOfDaysInMnth()
  
/**
 * The function to reset the date values in the buttons of the 
 * slots.
 */

function fillDates(dayOfWeek1,noOfDaysInmnth) {

 for(var i=1; i<43; i++) {
   str = "s"+i;
   document.forms[0].elements[str].value="   ";
 }


 startSlotIndx = dayOfWeek1;
 slotIndx = startSlotIndx;

 for(var i=1; i<(noOfDaysInmnth+1); i++) {
  slotName = "s"+slotIndx;

  val="";
  if (i<10) {
    val = " "+i+" ";
  } else {
    val = i;
  }

  document.forms[0].elements[slotName].value = val;
  slotIndx++;
 }
  
}//fillDates()
 

/**
 * The function that is called at the time of loading the page.
 * This function displays Today's date and also displays the 
 * the calendar of the current month.
 */

function thisMonth() {

  dt = new Date();
  mnth  = dt.getMonth(); /* 0-11*/
  dayOfMnth = dt.getDate(); /* 1-31*/
  dayOfWeek = dt.getDay(); /*0-6*/
  yr = dt.getFullYear(); /*4-digit year*/

  //alert("month:"+(mnth+1)+":dayofMnth:"+dayOfMnth+":dayofweek:"+dayOfWeek+":year:"+yr);

  mnthName = getMonthName(mnth)+ " ";
  document.forms[0].month.value = mnth;
  document.forms[0].year.value = yr;
  document.forms[0].currMonth.value = mnth;
  document.forms[0].currYear.value = yr;
  
  document.forms[0].monthYear.value = mnthName+yr;
  document.forms[1].dateField.value = dayOfMnth+"/"+(mnth+1)+"/"+yr;

  startStr = (mnth+1)+"/1/"+yr;
  dt1 = new Date(startStr);
  dayOfWeek1 = dt1.getDay(); /*0-6*/

  noOfDaysInMnth = getNoOfDaysInMnth(mnth+1,yr);
  fillDates(dayOfWeek1+1,noOfDaysInMnth);
 

}//thisMonth()

/**
 * The function that will be used to display the calendar of the next month.
 */

function nextMonth() {

 var currMnth = document.forms[0].month.value;
 currYr = document.forms[0].year.value;

 if (currMnth == "11") {
    nextMnth = 0;
    nextYr = currYr;
    nextYr++;
 } else {
   nextMnth=currMnth;
   nextMnth++;
   nextYr = currYr;
 }

 mnthName = getMonthName(nextMnth);
 document.forms[0].month.value=nextMnth;
 document.forms[0].year.value=nextYr;
 document.forms[0].monthYear.value= mnthName+" "+nextYr;

 str = (nextMnth+1)+"/1/"+nextYr;
 dt = new Date(str);
 dayOfWeek = dt.getDay();

 noOfDays = getNoOfDaysInMnth(nextMnth+1,nextYr);

 fillDates(dayOfWeek+1,noOfDays);
 

}//nextMonth()

/**
 * The method to display the calendar of the previous month.
 */

function prevMonth() {

 var currMnth = document.forms[0].month.value;
 currYr = document.forms[0].year.value;

 if (currMnth == "0") {
    prevMnth = 11;
    prevYr = currYr;
    prevYr--;
 } else {
   prevMnth=currMnth;
   prevMnth--;
   prevYr = currYr;
 }

 str = (prevMnth+1)+"/1/"+prevYr;
 dt = new Date(str);
 dayOfWeek = dt.getDay();

 /***********************************************
  * Remove the comment if do not want the user to 
  * go to any previous month than this current month.
  ***********************************************/

 /*

 runningMonth = document.forms[0].currMonth.value;
 rMonth=runningMonth;
 rMonth++;
 runningYear = document.forms[0].currYear.value;
 rYear=runningYear;

 str = (rMonth)+"/1/"+rYear;
 dt1 = new Date(str);
 
 if (dt.valueOf() < dt1.valueOf()) {
   alert('Cannot Go Before Current Month');
   return;
 }
 
 */

 /**************************************************
 * End of comment
 **************************************************/

 mnthName = getMonthName(prevMnth);
 document.forms[0].month.value=prevMnth;
 document.forms[0].year.value=prevYr;
 document.forms[0].monthYear.value= mnthName+" "+prevYr;

 noOfDays = getNoOfDaysInMnth(prevMnth+1,prevYr);
 fillDates(dayOfWeek+1,noOfDays);
 
}//prevMonth()