function chkPassword(obj)
{
    if(obj.value.length<6 || obj.value.length>20)
        return false;
    return true;        
}
function change_password()
{
	if(document.chang_password_form.old_password.value.length < 1)
 	{
		alert('Please Enter Your Old Password');
		//document.chang_password_form.old_password.value.length = "";
  		document.chang_password_form.old_password.focus();
  		return false;
 	}
	
	if(document.chang_password_form.new_password.value.length < 1)
 	{
		alert('Please Enter Your New Password');
		//document.chang_password_form.new_password.value.length = "";
  		document.chang_password_form.new_password.focus();
  		return false;
 	}
	if(!chkPassword(document.chang_password_form.new_password))
    {
        alert("Password must be of 6 to 20 characters" );
		//document.chang_password_form.new_password.value.length = "";
        document.chang_password_form.new_password.focus();
        return false;
    }
	if(document.chang_password_form.conf_password.value < 1)
 	{
		alert('Confirm Your Password');
  		document.chang_password_form.conf_password.focus();
  		return false;
 	}
	if(!chkPassword(document.chang_password_form.conf_password))
    {
        alert("Confirm Password must be of 6 to 20 characters" );
        document.chang_password_form.conf_password.focus();
        return false;
    }
	
	if((document.chang_password_form.conf_password.value) != (document.chang_password_form.new_password.value))
    {
        alert('New and Confirm Password should be same');
        document.chang_password_form.conf_password.focus();
        return false;        
    }
	 document.chang_password_form.submit();
}