CSS background opacity with rgba not working in IE 8:

background: rgba(255, 255, 255, 0.3); /* browsers */

filter: progid:DXImageTransform.Microsoft.gradient(GradientType=0,startColorstr='#4cffffff', endColorstr='#4cffffff'); /* IE */

Refer this site:
http://stackoverflow.com/questions/3975688/css-background-opacity-with-rgba-not-working-in-ie-8