Unsupported Properties and Values

Can anyone help me with the following four errors?

Error Unsupported property: -moz-opacity
Internet Explorer 6.0, 7.0, 8.0b1; Internet Explorer for Macintosh 5.2; Opera 8.0, 9.0; Safari 2.0, 3.0
line 69 A:hover .Galborder, A:active .Galborder { border: #6699FF 1px solid; cursor:pointer; filter:alpha(opacity=90);-moz-opacity:.90;opacity:.90; }

Error Unsupported property: filter
Firefox 1.5, 2.0, 3.0; Internet Explorer for Macintosh 5.2; Netscape 8.0; Opera 8.0, 9.0; Safari 2.0, 3.0
line 69 A:hover .Galborder, A:active .Galborder { border: #6699FF 1px solid; cursor:pointer; filter:alpha(opacity=90);-moz-opacity:.90;opacity:.90; }

Error Unsupported property: opacity
Firefox 1.5; Internet Explorer 6.0, 7.0, 8.0b1; Internet Explorer for Macintosh 5.2; Netscape 8.0; Opera 8.0, 9.0; Safari 2.0, 3.0
line 69 A:hover .Galborder, A:active .Galborder { border: #6699FF 1px solid; cursor:pointer; filter:alpha(opacity=90);-moz-opacity:.90;opacity:.90; }

Error Unsupported value: 'alpha(opacity=90)'
Internet Explorer 6.0, 7.0, 8.0b1
line 69 A:hover .Galborder, A:active .Galborder { border: #6699FF 1px solid; cursor:pointer; filter:alpha(opacity=90);-moz-opacity:.90;opacity:.90; }

Thank you!
AllSpaTCAsked:
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JosefVernerCommented:
These are not error but warnings or notices. There are many propietary or specific browser layout engine styles usually denoted with prefix: -moz for Gecko based brosers (Mozilla, Firefox), -webkit for Webkit browsers (Safari, Chrome, iPhone, Android), -o for Presto browsers (Opera) and Microsoft stared to use -ms for IE8. IE family has the most of the propietary styles.
Anyway the important thing is: if the browser won't recognize the style it will simply ignore it.

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