1. Never give height or width in px..unless it is necessary.
2. Never give 3. If u are writtnig document.getElementById somewhere in ur Client side fucntion and if u have the <as:scriptmanager with="" u="" then="" use="" mode="hold" xmlns:as="#unknown">i.e instead of document.getElementById("objID"); write $get("objID"); //as $get is browsewr compatible
4. If u have written code to hide < tr > remove that and palce a div in the tr and then show hide that div.. bcoz it does not work in Mozilla.
5. Avoid writing rowspan and colspans.
6. Write the java script function at the end of ur aspx page.
doubt regarding browser compatability[
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about browser compatibility.[
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Browser Compatibility Application[
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