function backtotop(){var x1=x2=x3=lftimer=0;var y1=y2=y3=0;var sfunci='';if(document.documentElement){x1=document.documentElement.scrollLeft||0;y1=document.documentElement.scrollTop||0}if(document.body){x2=document.body.scrollLeft||0;y2=document.body.scrollTop||0}x3=window.scrollX||0;y3=window.scrollY||0;var a1=Math.max(x1,Math.max(x2,x3));var kind_i=k=Math.max(y1,Math.max(y2,y3));if(k>0||kind_i>0)window.scrollTo(Math.floor(a1/2),Math.floor(k/2));kind_i=a1;lftimer=25;sfunci="backtotop()";if(a1>0||k>0){window.setTimeout(sfunci,lftimer)}};