// form validation function //
	function validate(form) 
	{
		var email = document.getElementById("entry.1.single");
		var email = email.value;
		//var nameRegex = /^[a-zA-Z]+(([\'\,\.\- ][a-zA-Z ])?[a-zA-Z]*)*$/;
		var emailRegex = /^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/;
		var messageRegex = new RegExp(/<\/?\w+((\s+\w+(\s*=\s*(?:".*?"|'.*?'|[^'">\s]+))?)+\s*|\s*)\/?>/gim);
	
		if(email == "") 
		{
			inlineMsg('email','<strong>Error</strong><br />You must enter your email address.',2);
			return false;
		}

		if(!email.match(emailRegex)) 
		{		
		    inlineMsg('entry.1.single','You have entered an invalid email address.',2);
		    return false;
	  	}
		
	  	return true;
	}
	
	function validateNotEmpty(form)
	{
		var name = document.getElementById("entry_0");
		text = name.value;
		if( text == "" || text.length < 5 || "name (first last)" == text)
		{
			inlineMsg('entry_0','<strong>Error</strong><br />You must enter your name and agree to the terms of the NDA to continue.',2);
			return false;			
		}
		
		return true;
	}

// START OF MESSAGE SCRIPT //

	var MSGTIMER = 20;
	var MSGSPEED = 5;
	var MSGOFFSET = 3;
	var MSGHIDE = 3;

	// build out the divs, set attributes and call the fade function //
	function inlineMsg(target,string,autohide) 
	{
		var msg;
		var msgcontent;
		if(!document.getElementById('msg')) 
		{
			msg = document.createElement('div');
			msg.id = 'msg';
			msgcontent = document.createElement('div');
			msgcontent.id = 'msgcontent';
			document.body.appendChild(msg);
			msg.appendChild(msgcontent);
			msg.style.filter = 'alpha(opacity=0)';
			msg.style.opacity = 0;
			msg.alpha = 0;
		} 
  		else 
  		{
		    msg = document.getElementById('msg');
		    msgcontent = document.getElementById('msgcontent');	
		}
		
		msgcontent.innerHTML = string;
		msg.style.display = 'block';
		var msgheight = msg.offsetHeight;
		var targetdiv = document.getElementById(target);
		targetdiv.focus();
		var targetheight = targetdiv.offsetHeight;
		var targetwidth = targetdiv.offsetWidth;
		var topposition = topPosition(targetdiv) - ((msgheight - targetheight) / 2);
		var leftposition = leftPosition(targetdiv) + targetwidth + MSGOFFSET;
		msg.style.top = topposition + 'px';
		msg.style.left = leftposition + 'px';
		clearInterval(msg.timer);
		msg.timer = setInterval("fadeMsg(1)", MSGTIMER);
		
		if(!autohide) 
		{
			autohide = MSGHIDE;  
		}
		
		window.setTimeout("hideMsg()", (autohide * 1000));
}

// hide the form alert //
function hideMsg(msg) {
  var msg = document.getElementById('msg');
  if(!msg.timer) {
    msg.timer = setInterval("fadeMsg(0)", MSGTIMER);
  }
}

// face the message box //
function fadeMsg(flag) {
  if(flag == null) {
    flag = 1;
  }
  var msg = document.getElementById('msg');
  var value;
  if(flag == 1) {
    value = msg.alpha + MSGSPEED;
  } else {
    value = msg.alpha - MSGSPEED;
  }
  msg.alpha = value;
  msg.style.opacity = (value / 100);
  msg.style.filter = 'alpha(opacity=' + value + ')';
  if(value >= 99) {
    clearInterval(msg.timer);
    msg.timer = null;
  } else if(value <= 1) {
    msg.style.display = "none";
    clearInterval(msg.timer);
  }
}

// calculate the position of the element in relation to the left of the browser //
function leftPosition(target) {
  var left = 0;
  if(target.offsetParent) {
    while(1) {
      left += target.offsetLeft;
      if(!target.offsetParent) {
        break;
      }
      target = target.offsetParent;
    }
  } else if(target.x) {
    left += target.x;
  }
  return left;
}

// calculate the position of the element in relation to the top of the browser window //
function topPosition(target) {
  var top = 0;
  if(target.offsetParent) {
    while(1) {
      top += target.offsetTop;
      if(!target.offsetParent) {
        break;
      }
      target = target.offsetParent;
    }
  } else if(target.y) {
    top += target.y;
  }
  return top;
}

// preload the arrow //
if(document.images) {
  arrow = new Image(7,80); 
  arrow.src = "/images/msg_arrow.gif"; 
}