var allHTMLTags = new Array();

function getElementByClass( theClass ) {

	var allHTMLTags = document.getElementsByTagName("*");

	for ( i = 0; i< allHTMLTags.length; i++ ) {

		if ( allHTMLTags[i].className == theClass ) {

			allHTMLTags[i].style.display = "none";

		}

	}

};

function overlay_on( test ) {

	if( document.getElementById( test ).style.display == "block") {

		document.getElementById( test ).style.display = "none";

	} else {

		//getElementByClass( "rollover" );
		document.getElementById( test ).style.display = "block";

	}

};

function overlay_off( test ) {

	document.getElementById( test ).style.display = "none";

};