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Cross-browser way to retrieve styles for elements via the DOM

document.getElementById('whatever').style only gives local styles, but if you want those specified in external CSS definitions, you have to arse about (why, oh, why?) and do it like this:

function newGetStyle(nodeName, sStyle) {
	var x = document.getElementById(nodeName);
	var y;
	if (x.currentStyle) {
		y = x.currentStyle[sStyle];
	} else {
		try {
		y = document.defaultView.getComputedStyle(x,null).getPropertyValue(sStyle);
	  } catch(e) { }
	}
	return y;
}
to css dom getcomputedstyle currentstyle by peter on Oct 29, 2006
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