function MM_openBrWindow(theURL,winName,features) { //v2.0
	window.open(theURL,winName,features);
}

function dateSelect(fName) { 
//fName = field Name
    var urlSel = '/calendario.aspx?dt=frmDados.' + fName;
    MM_openBrWindow(urlSel,'seldate','width=200,height=150');
}