function sendCard(url) {
    var popupWin = window.open(url, "Cartolina", "width=800,height=850,left=100,top=100,resizable=yes,toolbar=no,scrollbars=yes");
}

/* http://www.shiningstar.net 
<!-- Original by :  Ronnie T. Moore -->
<!-- Web Site:  The JavaScript Source -->
<!-- Use one function for multiple text areas on a page -->
<!-- Limit the number of characters per textarea -->
<!-- Begin */

function textCounter(field,cntfield,maxlimit) {
    if (field.value.length > maxlimit) // if too long...trim it!
        field.value = field.value.substring(0, maxlimit);
    // otherwise, update 'characters left' counter
    else
        cntfield.value = maxlimit - field.value.length;
}
//  End