jForce the script to consider a variable value as an array name and not...

Hi !

Could you let me know how to force the script to consider a variable value as an array name and not as a string...

In the following script, for exemple, the script considers '_tableau' as a string, and not, as i would wish, as an array name.

<script type="text/javascript">

A_tableau=['p_perso.jpg']
tableaux_tableau=['A_tableau']

function imager(tableau)
{
_tableau=tableau
setTimeout("alert(_tableau[0])", 100)
}

imager(tableaux_tableau[0])

</script>

Thanx for your lights !