Missing right paren and left brace

in order for you code to work it should look like this:

import fl.transitions.Tween;
import fl.transitions.easing.*;

var tween:Tween = new Tween(texte, "y", Strong.easeOut, 0, 0, 30);
var tween1:Tween = new Tween(texte2, "y", Strong.easeOut, 0, 0, 60);

tween.stop()
var urlLoader:URLLoader = new URLLoader()
urlLoader.addEventListener(Event.COMPLETE, completeXMLHandler)
function completeXMLHandler(evt:Event)
{
    var xml:XML = new XML(evt.target.data)
    texte.texte.htmlText = xml.descendants("texte")[0].text()
    texte2.texte2.htmlText = xml.descendants("texte2")[0].text()
    if(texte.height>masque.height)
    {
        if(texte2.height>masque2.height)
        {
            stage.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler)
        }
    }
}
urlLoader.load(new URLRequest("xml.xml"))
texte.texte.autoSize = TextFieldAutoSize.LEFT
texte2.texte2.autoSize = TextFieldAutoSize.LEFT
texte.y = masque.y
texte2.y = masque2.y
texte.mask = masque
texte2.mask = masque2
function mouseMoveHandler(evt:MouseEvent)
{
    /*on recupere la position de la souris par rapport au masque*/
    var p:Number = (mouseY-masque.y)/masque.height
    var p:Number = (mouseY-masque2.y)/masque2.height
    if(p<0)p=0
    if(p>1)p=1
    tween.continueTo(masque.y-p*(texte.height - masque.height),30)
    tween1.continueTo(masque2.y-p*(texte2.height - masque2.height),30)
}

first - why did you give to both of your tween objects the same name?

in the line -

texte2.texte2.htmlText = xml.descendants("texte2")[0].text()

there was a redundant '('.

and in the line -

tween1.continueTo(masque2.y-p*(texte2.height - masque2.height),30)

there was a missing ')' (i've also renamed the tween object to 'tween1')

that should do it i think