Hide instructional text when printing hard copy

i have following scripts in acrobat pdf document field properties instructional text appear when blank, , disappears if user types in field.  after filling out form, print hard copy, , wherever there blank field, instructional text prints too.  how can prevent printing?   thank in advance help!

 

// custom format script text field

if (!event.value) {

1. event.value = "instructional text goes here";
2. event.target.display = display.noprint;

} else {

1. event.target.display = display.visible;

}

 

// on focus script:

if (event.target.value==event.target.defaultvalue) {

1. event.target.value = "";
2. event.target.textcolor = ["rgb", 0/255, 153/255, 51/255]; 
3. event.target.textfont = "myriadpro-regular";
4. event.target.textsize = 0;

}

 

// on blur script:

if (event.target.value=="") {

1. event.target.value = event.target.defaultvalue;
2. event.target.textcolor = color.gray;
3. event.target.textfont = "myriadpro-it";
4. event.target.textsize = 0; // means auto

}

if lines of code include "a.", "b.", etc, each of scripts should generate errors. first script should be:

 

// custom format script text field

if (!event.value) {

    event.value = "instructional text goes here";

    event.target.display = display.noprint;

} else {

    event.target.display = display.visible;

}

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