Add fixed background Attachment to blog

By putting two lines of statements one can make blog background fixed ,it will add more attraction to blog page.
To do so just copy the code given below and paste it into Body {..} definition section of CSS
background-image:url(http://URL of background Image);
background-attachment:fixed;

like this...

body {/*background: */
margin:0;
color:#333333;
font:x-small Georgia Serif;
font-size/* */:/**/small;
font-size: /**/small;
text-align: center;
background-image:url(http://URL of background Image);
background-attachment:fixed;

}
Doing so will make you feel better than earlier while scrolling your blog's page ,only contents will be scroll not background image.