function page(){
var p = document.getElementById("pageinput").value;
if(isPositiveNum(p)){window.open("/sort/4_"+p+"/","_self");}
function isPositiveNum(s){
var re = /^[0-9]*[1-9][0-9]*$/ ;
return re.test(s)
}
}
document.getElementById("s4").style.cssText = "background-color:#CCCCCC";