t.prototype.loadScript=function(t){var e=this,r=document.createElement("script");r.src=t,r.charset="UTF-8",r.onload=function(t){return e.checkLoad()},r.onerror=function(r){return e.failed("Can't load \""+t+'"')},document.head.appendChild(r)}

remove after eval:
changed to

t.prototype.loadScript=function(t){var e=this,r=document.createElement("script");r.src=t,r.charset="UTF-8",r.onload=function(t){r.remove();return e.checkLoad()},r.onerror=function(r){return e.failed("Can't load \""+t+'"')},document.head.appendChild(r)}