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<html>
<head>
<style>
th, td { background: #ddd; }
table { border-collapse: collapse; }
</style>
</head>
<body>
<table border="1">
<tr><th>x</th><th colspan="2" class="a1 a2">A</th></tr>
<tr><th>x</th><td class="a1">a1</td><td class="a2">a2</td></tr>
</table>
<script type="text/javascript">
function addCSSRule(selector, rule) {
var css = document.styleSheets[ document.styleSheets.length -1];
css.insertRule(selector+" {"+rule+"}", css.cssRules.length);
}
function removeCSSRule(selector, rule) {
rule = rule.split(':');
for (cssno=0; cssno<document.styleSheets.length;cssno++) {
var css = document.styleSheets[cssno];
for (i=(css.cssRules.length-1);i>=0;i--) {
var rule = css.cssRules[i];
if (rule.selectorText == selector && rule.style[ rule[0] ] == rule[1])
css.deleteRule(i);
}
}
}
function setClassDisplay(display, classname) {
document.body.offsetWidth
if (display)
removeCSSRule("."+classname, "display:none");
else
addCSSRule("."+classname, "display:none");
}
setClassDisplay(false, 'a1');
setClassDisplay(false, 'a2');
setClassDisplay(true, 'a1');
setClassDisplay(true, 'a2');
</script>
</body>
</html>
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