<html><head><script type="text/javascript">function changeLineHeight(){document.getElementById("div1").style.lineHeight="2";}</script></head><body><div id="div1">This is some text. This is some text. This is some text.This is some text. This is some text. This is some text.This is some text. This is some text. This is some text.This is some text. This is some text. This is some text.</div><br /><input type="button" onclick="changeLineHeight()" value="Change line-height" /></body></html>