You want to show some overlay contents (e.g. dropdown menu items) over Flash objects.

Solution

You can enable z-index features of HTML to Flash objects by adding some parameters.

<object ...>
<param name="wmode" value="transparent" /›
<embed ... wmode="transparent"/›
</object>

I want to set the height of table rows in HTML.

Solution

You can set the height attribute in TR tags.

<tr><td height="50px">50</td><td>not set</td></tr>

[NOTE]  Be careful. You cannot set the height attribute in TR.

I want to merge two or more cells in a HTML Table

Solution

You can use “colspan” or “rowspan” attributes.

<tr><th colspan="3">merged cell</th></tr>
<tr><td>cell1</td><td>cell2</td><td>cell3</td></tr>

<tr><td rowspan="2">merged</td><td>cell2</td><td>cell3</td></tr>
<tr><td>cell4</td><td>cell5</td></tr>

I want to add one more classnames to one HTML tag

Solution:

It is not so hard, just put all the classnames with separated by spaces, like

<div class="class1 class2 class3"> ... </div>