Help with quiz for a learning object

So basically I want to make a quiz where the user identifies textures in images. The first image is of a shell. So I want the user to be able to type in their answer into a input text field, then press a “check answer” button. Then if they typed in shell “Correct” will appear in a dynamic text field or “incorrect” if they had typed in any other answer.

Could someone please help me with the action script required for this button, I am using action script 2 in flash cs4.

I found this code on the internet but it didn’t work.

on (release) {
if (input_instance_name==“correct answer”){
display_instance_name.text=“Correct!”;
}
else{
display_instance_name.text=“Wrong!”;
}
}