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I need a function to change the appearance of some elements in my HTML page "on the fly", but I am not able to do it.
The problem is that I cannot use a command like
document.write ('<style type="text/css">body {background-color: #cccccc;}</style>');
because I need to make the changes effective when the page is already loaded, using a link like
<a onmouseclick="Clicker(1)" href="#">clic</a>
and I cannot use a command like
document.body.style.background = '#cccccc';
because I do not know if it can be applied to other not so easy cases, because I need to change the appearance of elements such as td.myclass or sibling elements such as th[scope=col]+th[scope=col]+th[scope=col].
How can I do it? Thanks!