Javascript crashing Firefox 3.5.5 Windows but not Mac

[Cabbit]

Link to demo

// form validation function //
function validate(form) {
  var name = form.name.value;
  var password = form.password.value;
  var valPassLength = password.length;
  var valUserLength = name.length;
  var nameRegex = /^[a-zA-Z0-9]+(([\'\,\.\- ][a-zA-Z0-9 ])?[a-zA-Z0-9]*)*$/;
  var passwordRegex = /^[a-zA-Z0-9]+(([\'\,\.\- ][a-zA-Z0-9 ])?[a-zA-Z0-9]*)*$/;
  if(name == "") {
    inlineMsg('name','You must enter your username.',2);
    return false;
  }
  if(!name.match(nameRegex)) {
    inlineMsg('name','You have entered an invalid username.',2);
    return false;
  }
  if (valUserLength < 7)
  {
  	inlineMsg('name','<strong>Error</strong><br />Your username appears to be too short.',2);
    return false;
  }
  if(password == "") {
    inlineMsg('password','<strong>Error</strong><br />You must enter your password.',2);
    return false;
  }
  if(!password.match(passwordRegex)) {
    inlineMsg('password','<strong>Error</strong><br />Your password appears to be invalid.',2);
    return false;
  }
  if (valPassLength < 10)
  {
  	inlineMsg('password','<strong>Error</strong><br />Your password appears to be too short.',2);
    return false;
  }
  return true;
}

function submitButton(form)
{
	var name = form.name.value;
	var valUserLength = name.length;
	var nameRegex = /^[a-zA-Z0-9]+(([\'\,\.\- ][a-zA-Z0-9 ])?[a-zA-Z0-9]*)*$/;
	var passwordRegex = /^[a-zA-Z0-9]+(([\'\,\.\- ][a-zA-Z0-9 ])?[a-zA-Z0-9]*)*$/;
	var password = form.password.value;
  	var valPassLength = password.length;
	if (name == "" || !name.match(nameRegex) || valUserLength < 7 || password == "" || !password.match(passwordRegex) || valPassLength < 10) 
	{
		return false;
 	}
	else
	{
		document.getElementById('submitBTN').innerHTML = '<button type="submit" class="submit positive"><img src="/media/siteimages/buttons/tick.png" alt=""/> Login</button>';
	}
}

function submitButtonRTN(form)
{
	var name = form.name.value;
	var valUserLength = name.length;
	var nameRegex = /^[a-zA-Z0-9]+(([\'\,\.\- ][a-zA-Z0-9 ])?[a-zA-Z0-9]*)*$/;
	var passwordRegex = /^[a-zA-Z0-9]+(([\'\,\.\- ][a-zA-Z0-9 ])?[a-zA-Z0-9]*)*$/;
	var password = form.password.value;
  	var valPassLength = password.length;
	if (name == "" || !name.match(nameRegex) || valUserLength < 7 || password == "" || !password.match(passwordRegex) || valPassLength < 10) 
	{
	    document.getElementById('submitBTN').innerHTML = '<button type="submit" class="submit negative"><img src="/media/siteimages/buttons/cross.png" alt=""/> Login</button>';
	}
}

// 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 = "/media/login/msg_arrow.gif"; 
}

My ere Javascript seems to crash my friends Firefox but runs fine on my Safari, Firefox, Internet Exploder(Wine), and Opera. Is there a reason it would only effect his Firefox(Windows, both 3.5.5) i am dead new to this ere javascirpt stuff i was just working in my own scripts into those from a tutorial.

 

[elitesouth]

I've had js issues in Firefox for Windows in the past... ask your friend to downgrade their version and see what results you get.