Event.observe(window, 'load', init, false);

function init(){
	// Main Tab Horizontal menus
	Event.observe($('btn_home'), 'mouseover', mouseOverHome, false);
	Event.observe($('btn_about'), 'mouseover', mouseOverAbout, false);
	Event.observe($('btn_explore'), 'mouseover', mouseOverExplore, false);
	Event.observe($('btn_download'), 'mouseover', mouseOverDownload, false);


}



function mouseOverHome() {

$('submenuHome').show();
$('submenuExplore').hide();
$('submenuAbout').hide();
$('submenuDownload').hide();

}

function mouseOverAbout() {

$('submenuHome').hide();
$('submenuExplore').hide();
$('submenuAbout').show();
$('submenuDownload').hide();

}


function mouseOverExplore() {

$('submenuHome').hide();
$('submenuExplore').show();
$('submenuAbout').hide();
$('submenuDownload').hide();

}


function mouseOverDownload() {

$('submenuHome').hide();
$('submenuExplore').hide();
$('submenuAbout').hide();
$('submenuDownload').show();

}