나쁨:

<a id="myLink" href="javascript:MyFunction();">link text</a>

좋음:

<a id="myLink" href="#" onclick="MyFunction();">link text</a>

better:

<a id="myLink" href="#" onclick="MyFunction();return false;">link text</a> even better 1:

<a id="myLink" title="Click to do something" href="#" onclick="MyFunction();return false;">link text</a> even better 2:

<a id="myLink" title="Click to do something" href="PleaseEnableJavascript.html" onclick="MyFunction();return false;">link text</a> Why better? because return false will prevent browser from following the link

best:

Use jQuery or other similar framework to attach onclick handler by element's ID.

$('#myLink').click(function(){ MyFunction(); return false; });