Left side of assignment operator must be variable or property

Hi guys, thanks for all the help so far, i'm hoping this is an easy one for you to help me with.

Actionscript Code:

if (B_AuthorBox.text = "" && B_TitleBox.text =""){
        BookVar = BookVar;
    } else {
 BookVar = BookVar +1;
}

I keep getting this message

<b> Left side of assignment operator must be variable or property</b>

How can I get around it?

Thanks in advance

Bottlebank :clown:

Hi,

Try

BookVar +=1;

or

BookVar ++;

also

B_AuthorBox.text = "" && B_TitleBox.text =""

might need to be

B_AuthorBox.text == "" && B_TitleBox.text == ""

Awesome o' clock.

Thanks Fruitbeard