Run AE script directly in AE.

RunScript.jsx

(function drawUI(thisObj)
{
	function UI(thisObj){
		var win = (thisObj instanceof Panel) ? thisObj : new Window("palette","Run Script",[0,0,500,450],{resizeable:true,});
		if(win != null){
			var btn = win.add("button",[180,415,330,435],"Run");
			var script = win.add("edittext",[5,5,505,405] ,"Paste your code here, and run to test.",{readonly:0,noecho:0,borderless:0,multiline:1,enterKeySignalsOnChange:0});
			btn.onClick = function(){
				if(!app.preferences.getPrefAsLong("Main Pref Section", "Pref_SCRIPTING_FILE_NETWORK_SECURITY")){
					alert("Please check this option:\n'Preferences->General->Allow Scripts to Write Files and Access Network'");
					app.executeCommand(2359);
				}else{
					eval(script.text);
				}			
			};
	}else{
			alert("Faile to run the script, please try again.");
		}
		return win;
	}

	if(parseFloat(app.version) < 9.0){
		alert("Your AE version is too low to run the script...")
	}else{
		var drawPanel = UI(thisObj);
		if(drawPanel !== null){
			if(drawPanel instanceof Window){
					drawPanel.center();
					drawPanel.show();
			}else{
					drawPanel.layout.layout(true);
			}
		}
	}

})(this)