JS/HTML Hybrid Function??

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   I was wondering if it is possible to write a javascript function, say for a button, that would write some html to the page.

kind of like:

<script>
function thefunction(){
</script>

this is the html to insert

<script>
}
</script>

possible? or just a pipe dream?
basically what i need to do is add a new row of fields to a form when a button is pressed. Is there any other/better way to do this?