Dropdown list is filling with too many values

JS

function getSizes() {
	var site = document.getElementById("specSite").value;
	var type = document.getElementById("mediaType").value;
	var xSite = xmlDoc.getElementsByTagName("site");
	var xType = xmlDoc.getElementsByTagName("type");
	var xSize = xmlDoc.getElementsByTagName("adsize");
	for(var s=0; s<xSite.length; s++) {
		if(site == xSite[s].attributes.getNamedItem("name").value) {
			for(var t=0; t<xType.length; t++) {
				if(type == xType[t].attributes.getNamedItem("name").value) {
					for(var si=0; si<xSize.length; si++) {
						document.getElementById("iSize").innerHTML += "<option value=" + xSize[si].attributes.getNamedItem("size").value + ">" + xSize[si].attributes.getNamedItem("size").value + "</option>";
					}
				}
				break;
			}
		}
		break;
	}
}


XML

<sites>
	<site name="SITE">
		<adtypes>
			<type name="Image">
				<adsize size="300x250">
					<initial>40</initial>
					<polite>80</polite>
					<duration>15</duration>
					<fps>24</fps>
					<filetype>gif</filetype>
					<filetype>jpeg</filetype>
					<filetype>png</filetype>
				</adsize>
				<adsize size="336x280">
					<initial>40</initial>
					<polite>80</polite>
					<duration>15</duration>
					<fps>24</fps>
					<filetype>gif</filetype>
					<filetype>jpeg</filetype>
					<filetype>png</filetype>
				</adsize>
				<adsize size="300x600">
					<initial>40</initial>
					<polite>100</polite>
					<duration>15</duration>
					<fps>24</fps>
					<filetype>gif</filetype>
					<filetype>jpeg</filetype>
					<filetype>png</filetype>
				</adsize>

Hopefully you get the idea because there 2654 lines of code.

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