CSS Rules in DOM not including definitions for anchor tags

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Javascript

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For the following code:

var mysheet=document.styleSheets[0];
var myrules=mysheet.cssRules? mysheet.cssRules: mysheet.rules;
for (i=0; i<myrules.length; i++)

I'm looping through looking for my "a:link" rules to redefine my link style. I can see all the styles I've custom designed. But my anchor rules are not showing. Are the rules for only the user defined classes? Are tags excluded? Are anchors special?

Not quite sure where to look for this.

Tony