$("html").keydown(function(event){
if(event.which == "37")
$("#hero").animate({"left" : "-=30px"});
if(event.which == "39")
$("#hero").animate({"left" : "+=30px"});
if(event.which == "38")
$("#hero").animate({"top" : "-=30px"});
if(event.which == "40")
$("#hero").animate({"top" : "+=30px"});
});
How can I enable #hero to move diagonally?