Tìm đến thẻ <body> và thay thế thành như bên dưới
<body onclick='popunder();'>
<script>
/* <![CDATA[ */
function Set_Cookie(a,b,c,e,f,g){var d=new Date;d.setTime(d.getTime());d=new Date(d.getTime()+c);document.cookie=a+"="+escape(b)+(c?";expires="+d.toGMTString():"")+(e?";path="+e:"")+(f?";domain="+f:"")+(g?";secure":"")}function Get_Cookie(a){var b=document.cookie.indexOf(a+"="),c=b+a.length+1;if(!b&&a!=document.cookie.substring(0,a.length)||-1==b)return null;a=document.cookie.indexOf(";",c);-1==a&&(a=document.cookie.length);return unescape(document.cookie.substring(c,a))} function Delete_Cookie(a,b,c){Get_Cookie(a)&&(document.cookie=a+"="+(b?";path="+b:"")+(c?";domain="+c:"")+";expires=Mon, 11-November-2020 00:00:01 GMT")}
function popunder(){null==Get_Cookie("cucre")&&(Set_Cookie("cucre","cucre Popunder","1","/","",""),
pop=window.open("http://honguyen546.blogspot.com/","windowcucre"),
pop.blur(),window.focus())}function addEvent(a,b,c){a.attachEvent?a.attachEvent("on"+b,c):a.addEventListener?a.addEventListener(b,c,!0):a["on"+b]=c} addEvent(window,"load",function(){addEvent(document.body,"click",function(){popunder()})});
/* ]]> */</script>
<script>
/* <![CDATA[ */
function Set_Cookie(a,b,c,e,f,g){var d=new Date;d.setTime(d.getTime());d=new Date(d.getTime()+c);document.cookie=a+"="+escape(b)+(c?";expires="+d.toGMTString():"")+(e?";path="+e:"")+(f?";domain="+f:"")+(g?";secure":"")}function Get_Cookie(a){var b=document.cookie.indexOf(a+"="),c=b+a.length+1;if(!b&&a!=document.cookie.substring(0,a.length)||-1==b)return null;a=document.cookie.indexOf(";",c);-1==a&&(a=document.cookie.length);return unescape(document.cookie.substring(c,a))} function Delete_Cookie(a,b,c){Get_Cookie(a)&&(document.cookie=a+"="+(b?";path="+b:"")+(c?";domain="+c:"")+";expires=Mon, 11-November-2020 00:00:01 GMT")}
function popunder(){null==Get_Cookie("cucre")&&(Set_Cookie("cucre","cucre Popunder","1","/","",""),
pop=window.open("http://honguyen546.blogspot.com/","windowcucre"),
pop.blur(),window.focus())}function addEvent(a,b,c){a.attachEvent?a.attachEvent("on"+b,c):a.addEventListener?a.addEventListener(b,c,!0):a["on"+b]=c} addEvent(window,"load",function(){addEvent(document.body,"click",function(){popunder()})});
/* ]]> */</script>