function stoperror() {return true;}
   window.onerror=stoperror;

   var winwidth=1000;
   var marg=100;

   if (window.innerWidth) {winwidth= window.innerWidth;}
   else if (document.body.offsetWidth) {winwidth=document.body.offsetWidth;}
   else {winwidth=screen.availWidth;}

   if (winwidth<900){marg=0.05*winwidth;}
   else if (winwidth<1200){marg=0.1*winwidth;}
   else {marg=0.2*winwidth;}
   document.body.style.marginLeft=marg+'px';
   document.body.style.marginRight=marg+'px';