function addHandler(b,d,c,a){if(b.addEventListener){b.addEventListener(d,c,a?a:false)}else{if(b.attachEvent){b.attachEvent("on"+d,c)}else{alert("Add handler is not supported")}}}function removeHandler(a,c,b){if(a.removeEventListener){a.removeEventListener(c,b,false)}else{if(a.detachEvent){a.detachEvent("on"+c,b)}else{alert("Remove handler is not supported")}}};