Iframe not working inside column shortcode

Hi community

Bit stucked help me out….
I am developing a themes shortcode functionality .. added a column shortcode, working fine for all the media types except iframe and objects..
here is my code

function column_shortcode( $atts, $content = null ) {
	extract( shortcode_atts( array(
	  	'offset' =>'',
      	'size' => '',
	  	'position' =>''
      ), $atts ) );

	  $size=$atts['size'];
	  $style='';
	  if($size=='half'){$class='span6'; $id='spacer'; }
	  else if($size=='third') {$class='span4'; $id=''; $style='margin-right: 15px;'; }
	    else if($size=='fourth') {$class='span3'; $id='';  }
		  else if($size=='sixth') {$class='span2'; $id='Column';  }
	        else if($size=='two-third') {$class='span8'; $id=''; $style='margin-right: 5px; padding-right:10px;';}
			  else if($size=='three-fourth') {$class='span9'; $id=''; $style='margin-right: 5px;'; }
	   $out='
	          <div class="'.$class.'"  id="'.$id.'" style="'.$style.'">
			  <p>'.do_shortcode($content).'</p></div>
			';

	 return $out;
}
add_shortcode('column', 'column_shortcode');

please guide me on this