document.createElement('header');
document.createElement('nav');
document.createElement('section');
document.createElement('article');
document.createElement('aside');
document.createElement('footer');


function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

function centrePopup(theURL,winName,width,height,features) {
    var cTop = (screen.availHeight/2) - (height/2);
    var cLeft = (screen.availWidth/2) - (width/2);
    window.open(theURL,winName,'width='+width+',height='+height+',top='+cTop+',left='+cLeft+features);
}