Custom Import Package Problems

programming flash
1

I have a custom package:

package ma601jc {
	
	public class stringUtils {

		public function stringUtils() {
		}
		
		public function testFunction(input:String):String
		{
			return input;
			
		 }
	}
}

I import it into a different class in the same folder:

import ma601jc.stringUtils;

But when I use the testFunction() I get this error:
…anothercalss.as, Line ## 1120: Access of undefined property stringUtils.

To use the function I type:

trace(stringUtils.testFunction('Hello World'));