function hide_all() {

    var myDiv = document.getElementById('introductionDiv');
    myDiv.style.display = "none";
    
	var myDiv = document.getElementById('contactDiv');
    myDiv.style.display = "none";

    var myDiv = document.getElementById('artistsDiv');
    myDiv.style.display = "none";
}

function show_hide(theDiv){
	 hide_all();
     var myDiv = document.getElementById(theDiv);
	 myDiv.style.display = "block";
}
function closeWindow() {
window.open('','_parent','');
window.close();
}