function validate_form(form) {
  var name = form.author.value;
  var email = form.email.value;
  var phone = form.url.value;
  var emailRegex = /^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/;

  if (name == "" || name == "Enter Your Name") {
    inlineMsg('author','You must enter your name.', 3);
    return false;
  }
  if (email == "" || email == "Enter Your Email") {
    //inlineMsg('email','<strong>Error</strong><br />You must enter your email.',2);
	inlineMsg('email','You must enter your email.', 3);
    return false;
  }
  if (!email.match(emailRegex)) {
    //inlineMsg('email','<strong>Error</strong><br />You have entered an invalid email.',2);
	inlineMsg('email','You have entered an invalid email.', 3);
    return false;
  }
  if (phone == "" || phone == "Enter Your Telephone Number") {
    inlineMsg('url','You must enter your telephone number.', 3);
    return false;
  }
  var fileError = validate_file_extension(form.cv);
  if (fileError != null) {
	inlineMsg('cv', fileError, 5);
	return false;
  }
  
  return true;
}
function validate_file_extension(upload) {
    var filepath = upload.value;
   
    if (filepath.length != 0) {    
        var ok = false;
       
        filepath = filepath.toLowerCase();
       
        var finddot = filepath.lastIndexOf('.');
        var extension = filepath.substring(finddot, filepath.length);
		var extensions = new Array('.wps', '.docx', '.jpg', '.jpeg', '.rtf', '.zip', '.doc', '.pdf', '.txt'); // also in comment-upload.php      
        for (i=0; i<=extensions.length-1; i++) {
            if (extensions[i]==extension)
				ok = true;
        }
       
        if (ok != true) {
			var message = 'The file extension is not valid.  Any of the following are acceptable: ';
			for (i=0; i<=extensions.length-1; i++) {
				message = message + extensions[i];
				if (i < extensions.length-1) {
					message = message + ', ';
				} else {
					message = message + '.';
				}
			}
			return message;
        } else {
            return null;
        }
	}
	return null;
}
      
// 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 = "/wp-content/themes/Tauren/img/msg_arrow.gif"; 
}