function CenteredWindow(dest, windowName, w, h, scroll,resize,tool,loc) {
	var	winl = ((screen.width - w) / 2) - 10;
	var	wint = ((screen.height - h) / 2) - 25;
	winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable='+resize+',toolbars='+tool+',location='+loc+'';
win = window.open(dest, windowName, winprops)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }}

//Stylesheet Switcher Code
function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
    createCookie("style", title, 365);
}


function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  }
  return null;
}
function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1
       && a.getAttribute("rel").indexOf("alt") == -1
       && a.getAttribute("title")
       ) return a.getAttribute("title");
  }
  return null;
}
function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);

var checkString = new String();
function checkValues(frmMain) {
	checkString = "";
	checkItem("senderName", "\n- Your Name", frmMain.senderName.value);
	checkItem("senderEmail", "\n- Your Email Address", frmMain.senderEmail.value);
	checkItem("friendEmail", "\n- Friend's Email Address(es)", frmMain.friendEmail.value);
	if (!(checkString == "")) {
		alert("Please enter values for these items:" + String.fromCharCode(13, 13) + checkString);
	} else {
		if (!(isEmail(frmMain.friendEmail.value)) || ((frmMain.friendEmail2.value != "") && !(isEmail(frmMain.friendEmail2.value))) || ((frmMain.friendEmail3.value != "") && !(isEmail(frmMain.friendEmail3.value))) ) {
			alert("Please check your friend's email adress(es) and try again.");
		}
		else if (!(isEmail(frmMain.senderEmail.value))) {
			alert("Please check your email address and try again.");
		} else {
			frmMain.submit();
		}
	}
}

function checkItem(itemName, itemString, itemValue) {
	if (itemValue == "")
		checkString = checkString + itemString + String.fromCharCode(13);
}

function isEmail(str) {
	// are regular expressions supported?
	var supported = 0;
	if (window.RegExp) {
			var tempStr = "a";
			var tempReg = new RegExp(tempStr);
			if (tempReg.test(tempStr)) supported = 1;
	}
	if (!supported) 
			return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
	var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
	var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
	return (!r1.test(str) && r2.test(str));
}
	
window.onload = function(e) {
	if (document.getElementById) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
	}
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}