javascript: read from file as string

gistfile1

function build_string_from_name_page_file (name_page_file) {	
	var all_name_string	= "";
	var tmp_arr			= [];
	var tmp_str 		= "";
	if(name_page_file !=null) {
		all_name_string = "::";
		name_page_file.open("r");
		while(!name_page_file.eof){
			tmp_str = name_page_file.readln();
			tmp_arr = tmp_str.split("\t");
			if(tmp_arr.length == 2) {				
				all_name_string += ( tmp_arr[0] + "::" );
			};
		};
		name_page_file.close();
	};
	return all_name_string;
};