//function vercalendario(calForm, formName){ 
//eval('document.'+formName+'.diadevisita.value = calForm');
//eval('document.'+formName+'.diadevisita2.value = calForm');
//var calWin = window.open('calendario.html',formName,'scrollbars=no,menu=no,width=270,height=140,top=125,left=325');
//calWin.focus();
// }
// <a href="javascript:vercalendario('','formservicios');"> 

function vercalendario(calForm, formName){ 
eval('document.'+formName+'.diadevisita.value = calForm');
eval('document.'+formName+'.diadevisita2.value = calForm');
var calWin = window.open('calendario.html',formName,'scrollbars=no,menu=no,width=270,height=140,top=125,left=325');
calWin.focus();
 }