function addEvent(elm, evType, fn, useCapture) {
	if (elm.addEventListener) { elm.addEventListener(evType, fn, useCapture); return true; }
	else if (elm.attachEvent) { var r = elm.attachEvent('on' + evType, fn); return r; }
	else { elm['on' + evType] = fn; }
}

function centerPlus()
{
	var div;
	if (div = document.getElementById('plusSign'))
	{
		var divBG = document.getElementById('transparentBG');
		div.style.marginTop = '-' + ((divBG.offsetHeight / 2) + 80).toString() + 'px';
	}
}

addEvent(window, 'load', centerPlus, false);