function vldFrm_RSVP(){
	var vname, vemail, vnumattend;
	var result = true;
	var msg="";
	
	with(window.document.frmRSVP)
    {
      vname      = name.value;
      vemail     = email.value;
      vnumattend = numattend.value;
    }
	
	if (vname=="") {
			msg+="Please include your full name!\n";
			result = false;
	}
	if( (trim(vemail) == "") || !isEmail(trim(vemail)) )
    {
      msg+="Please enter a valid email address\n";
      result = false;
    }
	if (vnumattend=="") {
			msg+="Please indicate how many will attend!\n";
			result = false;
	}
	if ( !isNum(vnumattend) ) {
	  msg+="'Number attending' must be a valid integer value.\n";
	  result = false;
	}
	if(msg==""){
	  return result;
	}{
	  alert(msg)
	  return result;
	}
}
/*
Strip whitespace from the beginning and end of a string
*/
function trim(str)
{
   return str.replace(/^\s+|\s+$/g,'');
}
/*
   Check if a string is in valid email format. 
*/
function isEmail(str)
{
var regex = /^[-_.a-z0-9]+@(([-a-z0-9]+\.)+(ad|ae|aero|af|ag|ai|al|am|an|ao|aq|ar|arpa|as|at|au|aw|az|ba|bb|bd|be|bf|bg|bh|bi|biz|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|com|coop|cr|cs|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gh|gi|gl|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|in|info|int|io|iq|ir|is|it|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|mg|mh|mil|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|museum|mv|mw|mx|my|mz|na|name|nc|ne|net|nf|ng|ni|nl|no|np|nr|nt|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|pro|ps|pt|pw|py|qa|re|ro|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)|(([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5])\.){3}([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5]))$/i;
return regex.test(str);
}
/*
   Check if a string only contains numbers
*/
function isNum(str)
{
  if (str.length == 0)
    return false;
  for (var n = 0; n < str.length; n++)
    if (str.substring(n, n+1) < "0" || str.substring(n, n+1) > "9")
      return false;
  return true;
}