[Error] backgroundColor : setting a property that has only a getter !

Hello,

I've posted my question on the dev-tech-javascript list, but maybe it's
a DOM question ;-)

I use a jQuery TreeView where I'd like to change backgroundColor for
some elements...
So, I've written this code :

function refreshStriping () {
	var collect_ul, fils, petits_fils, i, j, k;
	// On récupère la collection de tous les 'ul'
	collect_ul = document.getElementsByTagName("ul");
	for (i=0;i<collect_ul.length;i++) {
		fils = collect_ul[i].childNodes;
		for (j=0;j<fils.length;j++) {
			if (fils[j].tagName == "li") {
				petits_fils = fils[j].childNodes;
				for (k=0;k<petits_fils.length;k++) {
					if (petits_fils[k].tagName = "span") {
						petits_fils[k].style.backgroundColor:yellow";
					}
				}
			}
		}
	}
}

But I have this error :
- setting a property that has only a getter !

I don't understand why I can't...
Do you have any clue ?

Thanks a lot.

David.

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