function addOption(selectbox,text,value ) {
    var optn = document.createElement("OPTION");
    optn.text = text;
    optn.value = value;
    selectbox.options.add(optn);
    }
function addOption_list(selectbox)
{
  var month = new Array("January","February","March","April","May","June",
                        "July","August","September","October","November","December");
  for (var i=0; i < month.length;++i){
    addOption(document.getElementById("ctl00_ContentPlaceHolder1_mm"), month[i],month[i]);
  }
  for (var i=1; i<32; ++i){
    addOption(document.getElementById("ctl00_ContentPlaceHolder1_dd"), i, i);
  }
  for (var i=1940; i<2010; ++i){
    addOption(document.getElementById("ctl00_ContentPlaceHolder1_yy"), i, i);
  }
      
}

function monthvalid(selectbox)
  {
  
  var monval=document.getElementById("ctl00_ContentPlaceHolder1_mm");
  
  if (monval.value=="January" || monval.value=="March" || monval.value=="May" || monval.value=="July" || monval.value=="August" || monval.value=="October" || monval.value=="December")
  {
    var cleardd=document.getElementById("ctl00_ContentPlaceHolder1_dd");
    var cnt=cleardd.options.length;
    for (var j=1; j<cnt; j++)
     {
     cleardd.remove(1);
    }
 
   for (var i=1; i<32; ++i)
   {
    addOption(document.getElementById("ctl00_ContentPlaceHolder1_dd"), i, i);
  }
  }
  
  if (monval.value=="April" || monval.value=="June" || monval.value=="September" || monval.value=="November")
  {
    var cleardd=document.getElementById("ctl00_ContentPlaceHolder1_dd");
    var cnt=cleardd.options.length;
    for (var j=1; j<cnt; j++)
     {
     cleardd.remove(1);
    }
 
   for (var i=1; i<31; ++i)
   {
    addOption(document.getElementById("ctl00_ContentPlaceHolder1_dd"), i, i);
  }
  }
  
  if (monval.value=="February")
  {
    var cleardd=document.getElementById("ctl00_ContentPlaceHolder1_dd");
    var cnt=cleardd.options.length;
    for (var j=1; j<cnt; j++)
     {
     cleardd.remove(1);
    }
    
    var yr=document.getElementById("ctl00_ContentPlaceHolder1_yy");
 
    var leap=yr.value%4;
     
     
     if (leap==0)
     {
     
     for (var i=1; i<30; ++i)
     {
         addOption(document.getElementById("ctl00_ContentPlaceHolder1_dd"), i, i);
     }
     }
     else
     {
     for (var i=1; i<29; ++i)
     {
         addOption(document.getElementById("ctl00_ContentPlaceHolder1_dd"), i, i);
     }
     }
  }
    
  
  }
  function yervalid(selectbox)
  {
   var yrval=document.getElementById("ctl00_ContentPlaceHolder1_yy");
    var monval=document.getElementById("ctl00_ContentPlaceHolder1_mm");
    if (monval.value=="February")
    {
       
        var leap=yrval.value%4;
        
         var cleardd=document.getElementById("ctl00_ContentPlaceHolder1_dd");
         var cnt=cleardd.options.length;
         for (var j=1; j<cnt; j++)
            {
             cleardd.remove(1);
             }
    if (leap==0)
     {
     
     for (var i=1; i<30; ++i)
     {
         addOption(document.getElementById("ctl00_ContentPlaceHolder1_dd"), i, i);
     }
     }
     else
     {
     for (var i=1; i<29; ++i)
     {
         addOption(document.getElementById("ctl00_ContentPlaceHolder1_dd"), i, i);
     }
     }
     }
  }