// JavaScript Document
<!--
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->

<!--

function checkComm(field) {
  if (field.value.indexOf("'") != -1) {
    alert("Por Favor NO ingrese Comillas en los campos\n");
  }
  if (field.value.indexOf("\"") != -1) {
    alert("Por Favor NO ingrese Comillas en los campos\n");
  }
}


function checkRequiredFields(input)
{

    var requiredFields = new Array("nombre","apellido","email");

    // TEXT TO DISPLAY THAT DESCRIBES THE MISSING FIELD(S) TO THE USER
    var fieldNames = new Array("Nombre","Apellido","E-Mail");


    // YOU SHOULD NOT NEED TO MAKE ANY CHANGES BELOW THIS POINT ------

    var fieldCheck   = true;
    var fieldsNeeded = "\nPor favor complete los siguiente campo(s):\n\n\t";

    for(var fieldNum=0; fieldNum < requiredFields.length; fieldNum++) {
        if ((input.elements[requiredFields[fieldNum]].value == "") ||
            (input.elements[requiredFields[fieldNum]].value == " ")) {

            fieldsNeeded += fieldNames[fieldNum] + "\n\t";
            fieldCheck = false;
        }
    }

    // ALL REQUIRED FIELDS HAVE BEEN ENTERED
    if (fieldCheck == true)
    {
        return true;

    }
    // SOME REQUIRED FIELDS ARE MISSING VALUES
    else
    {
        alert(fieldsNeeded);
        return false;
    }

}

//-->

function validar(){

if (fecha.mes.value != '#' && fecha.anio.value != '#') {
   return true
} else {
   alert("Por favor elija un mes y aņo")
   return false
}
}

function validarem(){

if (empresas.empresa.value != '#') {
   return true
} else {
   alert("Por favor elija una empresa")
   return false
}
}
<!-- POPUP // -->
// JavaScript Document
function popup(nombre,archivo,w,h){
var nombre,archivo,w,h;
window.open('popup.php?album='+nombre+'&id='+archivo,'','scrollbars=no,top='+Math.floor(screen.height/2-h/2)+',left='+Math.floor(screen.width/2-w/2)+',width='+w+',height='+h+',resizable=no');
}