XML Parsing From Request To Website For Weather Info

I am currently working on a project that parses xml from a request to a website for weather information. I have had success parsing other elements so I know that my code is working. I'm just stuck with a particular element. The xml response is as follows:

Code:
<adc_database>
<forecast>
<day number="1">
<daytime>
<hightemperature>93</hightemperature>
<lowtemperature>60</lowtemperature>
</daytime>
</day>
<day number="2">
<daytime>
<hightemperature>90</hightemperature>
<lowtemperature>58</lowtemperature>
</daytime>
</forecast>
</adc_database>

This is only a short version of the xml response. I am trying to fetch information in the "daytime" tags for each day, as there are multiple days. I am however, not having good success. I am using javascript to parse code is as follows:

Code:
function findChild (element, nodeName)
{
var child;
for (child = element.firstChild; child != null; child = child.nextSibling)
{
if (child.nodeName == nodeName)
return child;
}
return null;
} .....

I have not specified any declarations and other code in here as its working and probably not necessary to waste space. I just need to fix my looping to populate the array with the correct information. Only needing to populate it with the elements under the daytime tag which is located under each day. This in turn is all located under the Forecast tag.