what does ! mean

in the following i statemen what does the ! mean

thanks

Andrew


if (!document.getElementById('blink').style.color){
document.getElementById('blink').style.color="red"
}

! is a logical not. If document.getElementById('blink').style.color is false, an empty string, 0, NaN, undefined or null, the logical not will negate it to true. In all other cases, it will negate it to false.

This means that document.getElementById('blink').style.color will be given a value 'red' if it doesn't already have a value.

thanks for the help..

Andrew