[support] Text Formats : Allow text alignment?

Hi, How do I allow text alignment in my Filtered HTML text format? I am using WYSIWYG with CKeditor.. I have enabled the alignment buttons and they work but the tags are being filtered.. The <p style="text-align: justify; "> tag is being changed to <p> when showing on the page.. The <p> tag is allowed but not the styling.. Any ideas?