function FixHTML( leftblocksID, centerblocksID, rightblocksID ) {
    var ua = navigator.userAgent.toLowerCase();
    var is_old_ie = (ua.indexOf("msie") != -1) && (ua.indexOf("msie 8") == -1) && (ua.indexOf("msie 9") == -1) && (ua.indexOf("opera") == -1);
    
    var leftblocks = document.getElementById(leftblocksID);
    var centerblocks = document.getElementById(centerblocksID);
    var rightblocks = document.getElementById(rightblocksID);

    if ( document.body.getAttribute('class') || document.body.getAttribute('className') ) {
        var classValue = 'left-center-right';
        
        /* Check HTML id attribute. */
        if ( leftblocks && centerblocks && !rightblocks ) classValue = 'left-center';
        if ( !leftblocks && centerblocks && rightblocks ) classValue = 'center-right';
        if ( !leftblocks && centerblocks && !rightblocks ) classValue = 'center';
        
        /* Set js_on to body class attribute  */
        classValue += ' js_on';
        
        /* Set body class attribute by HTML structure. */
        if ( is_old_ie ) {  /* IE8, IE7, IE6 */
            document.body.setAttribute('className', classValue);
        } else {  /* Gecko, Opera, Safari, IE9 and other */
            document.body.setAttribute('class', classValue);
        }
    }
}
