Вставки в код PHP Javascript

?><script type="text/javascript"> var desc='<?php echo $Itemid;?>'; alert(desc); </script> <?php

<script type="text/javascript"> var desc='{$Itemid}'; alert(desc); </script>

<style type="text/css">
<!--
.browse
{
width: 100%;
border: 1px solid #CCCCCC;
}
-->
</style>

?><script type="text/javascript">
var desc='LM=<?php echo _VALID_LM;?> ANT=<?php echo _VALID_ANT;?> MOS=<?php echo _VALID_MOS;?> LM_ADMIN=<?php echo _VALID_LM_ADMIN;?>';
alert(desc);
</script> <?php

echo "<script> alert('"._LOGIN_BLOCKED."'); window.history.go(-1); </script>\n";