simply selecting a tag

How do you select a html tag for use with javascript? E.g.

<script>

// selects the H1 tags, that's all

var h1 = document.h1;

</script>

Code (markup):

<h1> hi </h1>

HTML:

 

you can get the tags using 'getElementsByTagName' function.

var firstHeadings = obj.getElementsByTagname("h1");

if (firstHeadings.length > 0) {
  myH1 = firstHeadings[0];
}

Code (markup):

 

no idea dear...