function begin(){
	ev(document.getElementById('campaign_a'), 'mouseover', c_swap);
	ev(document.getElementById('campaign_b'), 'mouseover', c_swap);
	ev(document.getElementById('campaign_c'), 'mouseover', c_swap);
}

function gt(e){
	var targ;
	if (!e) var e = window.event;
	if (e.target) targ = e.target; else if (e.srcElement) targ = e.srcElement;
	if (targ.nodeType == 3) targ = targ.parentNode;
	return targ;
}

function c_hide(e){
	var a=document.getElementById('campaign_ai');
	var b=document.getElementById('campaign_bi');
	var c=document.getElementById('campaign_ci');

	if(a)a.style.display = 'none';
	if(b)b.style.display = 'none';
	if(c)c.style.display = 'none';
}

function c_swap(e){
	c_hide();
	document.getElementById(gt(e).id + 'i').style.display = 'block';
}

function ev(t,en,h)
{
	if(t){
	if (t.addEventListener )
		t.addEventListener(en, h, false);
	else if ( t.attachEvent )
		t.attachEvent('on' + en, h);
	else
		t['on' + en] = h;
	}
}