The CSS Validator has a problem with the: 64px\9 and 10px\9

what is the correction ?

Code:
input.file { opacity: 0; -moz-opacity: 0; filter: alpha(opacity=0); height: 54px; width /*\**/: 64px\9; margin /*\**/: 0 0 0 -10px\9 font-size: 8px; z-index: 200; } /* IE8 */
and this line below.: no-repeat left\9

Code:
.search-button strong { background: url(images/search-button.jpg) no-repeat left; background /*\**/: url(images/search-button.png) no-repeat left\9; padding: 1em 0 1em 5px; margin-right: 10px; cursor: pointer; }

all help greatly appreciated