function toggle(name,img) {
	project('' + name + ''), opaque('th-' + name + ''), swap('' + name + 'img','' + img + '');
}

var current = 0;

// toggle project visibility
function project(toTog) {
	obj = document.getElementById(toTog);
		if( obj ) { 
			if( current ) current.style.display = "none"; 
			obj.style.display = "block"; 
			current = obj; 
		}
}

// set currently selected thumbnail to 100% opacity, return others to translucent
function opaque(id) {
	document.getElementById(thumb).className="off";
	document.getElementById(id).className="on";
	thumb=id;
}

// swap project images
function swap(workid,imgsrc) {
	document.getElementById('' + workid + '').style.background='url(i/' + imgsrc + ')';
}