Final Code

//Settings
var frameurl = "http://Localhost/"; //Url  where the content of the tab is located
var tabname = "Tabname";  //What appears on the Tab Label
var imgloc = "Images/icon.png"; //Location of tab image icon, 24px x 24px. Default located in Modern/Images/
var placement = 3; //How many lines down the new tab will go

//Tab on left side of page

var img = document.createElement("img");
img.setAttribute("src", imgloc);
img.setAttribute("alt", tabname);

var span = document.createElement("span");
span.innerHTML = tabname;

var link = document.createElement("a");
link.setAttribute("class", "sidetab");
link.setAttribute("href","#tab_" + tabname);
link.setAttribute("id", "tabhead_" + tabname);

link.appendChild(img);
link.appendChild(span);
//Building code on page
var sidetabs = document.getElementById("sidetabs");
var after_link = sidetabs.getElementsByTagName("a")[placement];
sidetabs.insertBefore(link, after_link);

//Page Content
//Main Div
var tabdiv = document.createElement("div");
tabdiv.setAttribute("class", "tabarea");
tabdiv.setAttribute("id", "tab_" + tabname);
tabdiv.innerHTML = ("<h3>" + tabname + "</h3>");
//Iframe
var tabiframe = document.createElement("iframe");
tabiframe.setAttribute("src",  frameurl);
tabiframe.setAttribute("height", "500px");
tabiframe.setAttribute("width", "100%");
//Second Div
var tabconents = document.createElement("div");
tabconents.setAttribute("class", "tabcontents");
//Third Div
var maparea = document.createElement("div");
maparea.setAttribute("id", "maparea")

//Building code onto page
maparea.appendChild(tabiframe);
tabconents.appendChild(maparea);
tabdiv.appendChild(tabconents);

document.getElementById("tabs").appendChild(tabdiv);