function validate_date(a)
{
 var err=0;
 var psj=0;  
 if (a.length != 10) 
 {
 	err=1
 	alert("Date value is not complete")
 	return 0
 }
 b = a.substring(3, 5)// month
 c = a.substring(2, 3)// '/'
 d = a.substring(0, 2)// day
 e = a.substring(5, 6)// '/'
 f = a.substring(6, 10)// year

if (b<1 || b>12 || isNaN(b)==true) 
{
	alert("Invalid month  "+b)
	return 0
	err = 1
}

if (isNaN(d)==true) 
{
	alert("Invalid Day  "+d)
	return 0
	err = 1
}

if (isNaN(f)==true) 
{
	alert("Invalid Year  "+f)
	return 0
	err = 1
}
if (c != '/') err = 1
if (d<1 || d>31) err = 1
if (e != '/') err = 1
if (f<1935 || f>9999) err = 1

if (b==2 || b==4 || b==6 || b==9 || b==11)
{
   if (d==31) 
   {
	   err=1
	   alert("Month "+b+" doesn't have 31 days!") 		
	   return 0
   }
}

if (b==2)
{
	 // feb
	 var g=parseInt(f/4)
	 if (isNaN(g))
	  {
		  err=1
	  }
	  if (d>29) 	  
	  {
	  	err=1
		alert("February " +f+ " doesn't have " +d+ " days!"); 
	    return 0; 
	  }
	  if (d==29 && ((f/4)!=parseInt(f/4))) 
	  {
		  err=1
		  alert("February " +f+ " doesn't have " +d+ " days!"); 
	      return 0; 
	  }
	  
 } 
 if (err==1)
  {
	  alert("Invalid Date")
	  return 0
   }
  else
  {
  	return 1
  }	
}