Loop to find ul tag with correct id

I'm working on building a script that will loop through all ul's on the page and grab the one with the correct id, but am having slight difficulties.  Any thoughts:

var ul = document.getElementsByTagName("ul");
var polite = ["input1", "input2", "input3"];
for(var u=0; u<ul.length; u++) {
	for(var p=0; p<ul.attributes.length; p++) {
		if(ul[p].getAttribute("id") == polite[p]) {
			polite = ul[p];
		}
	}
}
console.log(polite);
var politeLoads = polite.getElementsByTagName("input");

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