var textRegex = /^[a-zA-Z0-9]+(([\'\,\.\- ][a-zA-Z0-9 ])?[a-zA-Z0-9\.]*)*$/;
var emailRegex = /^\w+([-|\.]\w+)*@\w+([-|\.]\w+)*\.\w+(-*\w+)*$/;
var phoneRegex = /^(((\+| \+ )?[0-9]{1,3}(-| )?\(?[0-9]{1,3}\)?(-| )?[0-9]{1,5})|(\(?[0-9]{2,6}\)?))(-| )?([0-9]{2,4})(-| )?([0-9]{4,5})(( \w{1,3}| \w{1,3} )[0-9]{1,5}){0,1}$/;
var messageRegex = new RegExp(/<\/?\w+((\s+\w+(\s*=\s*(?:".*?"|'.*?'|[^'">\s]+))?)+\s*|\s*)\/?>/gim);
var zipRegex = /^(?:[a-zA-Z0-9]+([- ]?[a-zA-Z0-9]+)*)?$/;

// START OF MESSAGE SCRIPT //

var MSGTIMER = 20;
var MSGSPEED = 5;
var MSGOFFSET = 10;
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;
}



var curDate = new Date();
var minYear= curDate.getFullYear();
var maxYear= curDate.getFullYear() + 3;

function isDate(txtDate){
	var objDate;
	var mSeconds;
	var day;
	var month;
	var year;
	// date length should be 10 characters (no more no less)
	if (txtDate.length !== 10) {
		return false;
	}
	// third and sixth character should be '/'
	if (txtDate.substring(2, 3) !== '/' || txtDate.substring(5, 6) !== '/') {
	    return false;
	}
	// extract month, day and year from the txtDate (expected format is mm/dd/yyyy)
	// subtraction will cast variables to integer implicitly (needed for !== comparing)
	month = txtDate.substring(0, 2) - 1; // because months in JS start from 0
	day = txtDate.substring(3, 5) - 0;
	year = txtDate.substring(6, 10) - 0;
	// test year range
	if (year < minYear || year > maxYear) {
	    return false;
	}
	// convert txtDate to milliseconds
	mSeconds = (new Date(year, month, day)).getTime();
	// initialize Date() object from calculated milliseconds
	objDate = new Date();
	objDate.setTime(mSeconds);
	// compare input date and parts from Date() object
	// if difference exists then date isn't valid
	if (objDate.getFullYear() !== year || objDate.getMonth() !== month || objDate.getDate() !== day) {
	    return false;
	}
	// otherwise return true
	return true; 
}