I have this PHP error HELP! how can i fix this

<style>
body { behavior: url("csshover3.htc"); }
.bbcode_hover { background-image: url('icons/bold.gif'); background-color: transparent; height: 20px; width: 20px; border: 0px; }
.bbcode_hover:hover { background-image: url('icons/bold_on.gif'); background-color: transparent; height: 20px; width: […]

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