// Add navigation buttons to the page
// This script puts 3 buttons on top of every page (except the first one that has one button)
// First button "<" : takes to the previous page
// Second button: "1" : takes to the first page of the document
// Third button: ">" : takes to the next page in the document (does not exists on the last page)

var inch = 72;
color.gray = new Array("RGB", 0.7, 0.7, 0.7); 
try 
{
    nLastPage = this.numPages - 1;
    for (var p = 0; p < this.numPages; p++)
    {
        var x = 0.5;
        if (p > 0)
        {
            AddButton(p,x,0.5,0.25,0.25,"PrevPage","<","Previous Page","this.pageNum--;"); // left arrow, previous page
            x += 0.3;
        }
        if (p != 0)
        {
            AddButton(p,x,0.5,0.25,0.25,"StartPage","1","Go To First Page","this.pageNum=0;"); // "1", takes to the first page
            x += 0.3;
        }
        if (p < nLastPage)
        {
            AddButton(p,x,0.5,0.25,0.25,"NextPage",">","Next Page","this.pageNum++;"); // right arrow, next page
            x += 0.3;
        }
        AddButton(p,x,0.5,0.25,0.25,"Back","<<","Go Back","app.execMenuItem(\"GoBack\");"); // right arrow, next page
        x += 0.3;
    }
}

catch (e)
{
        app.alert(e);
}

// AddButton function creates a button with given parameters and action
function AddButton(nPageNum, x, y, width, height, strText, strCaption, strToolTip, strAction)
{
    var aRect = this.getPageBox( { nPage: nPageNum} );

                         aRect[1] += 0.40 * inch ;
                         aRect[0] -= 0.10 * inch ;

    aRect[0] += x * inch;
    aRect[1] -= y * inch;
    aRect[2] = aRect[0] + width * inch;
    aRect[3] = aRect[1] - height * inch;

    var f = this.addField(strText,"button", nPageNum, aRect);
    f.setAction("MouseUp",strAction);
    f.userName = strToolTip;
    f.delay = true;
    f.borderStyle = border.s;
    f.highlight = "push";
    f.textSize = 0; // autosized
    f.textColor = color.gray;
    f.strokeColor = color.gray;
    f.fillColor = color.white;
    // you can specify a different font here, otherwise it uses a default one
    //f.textFont = font.ZapfD;
    f.buttonSetCaption(strCaption); 
    f.delay = false;
}