// Este script maneja los cuadros random del top

var ic = 16; // Number of alternative images 
var xoxo = new Array(ic); // Array to hold filenames 
var datos = new Array(ic); // Array to hold filenames 
xoxo[0] = "foto_1"; datos[0] = "Courtesy Gustavo Politis"; 
xoxo[1] = "foto_2"; datos[1] = "Courtesy Jean Louis Venne";
xoxo[2] = "foto_3"; datos[2] = "Courtesy Philip Greenspun"; 
xoxo[3] = "foto_4"; datos[3] = "Courtesy the Science Museum of Minnesota"; 
xoxo[4] = "foto_5"; datos[4] = "Courtesy Jürg Wittwer"; 
xoxo[5] = "foto_6"; datos[5] = "Courtesy Lancashire County Museum Service, Preston, England"; 
xoxo[6] = "foto_7"; datos[6] = "Courtesy Pratheep P S"; 
xoxo[7] = "foto_8"; datos[7] = "Courtesy Peter Higginbotham"; 
xoxo[8] = "foto_9"; datos[8] = "Courtesy Arun Ganesh"; 
xoxo[9] = "foto_10"; datos[9] = "Photograph by Lindsay Buck, courtesy Stephen Buck"; 
xoxo[10] = "foto_11"; datos[10] = ""; 
xoxo[11] = "foto_12"; datos[11] = ""; 
xoxo[12] = "foto_13"; datos[12] = ""; 
xoxo[13] = "foto_14"; datos[13] = ""; 
xoxo[14] = "foto_15"; datos[14] = ""; 
xoxo[15] = "foto_16"; datos[15] = ""; 

function pickRandom(range) { 
	if (Math.random) 
		return Math.round(Math.random() * (range-1)); 
	else { 
		var now = new Date(); 
		return (now.getTime() / 1000) % range;
	}
}
// Write out an IMG tag, using a randomly-chosen image name. 
var choice = pickRandom(ic); // --> 

// Fin del script


function Popup_centrado(theURL,winName,features,ancho,alto) { 
   var left = Math.floor( (screen.width-ancho) / 2);
   var top = Math.floor( (screen.height-alto) / 2);
   var parametros = features + ',top=' + top + ',left=' + left + ',width=' + ancho + ',height=' + alto;
   window.open(theURL,winName,parametros);
}


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_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_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 MM_goToURL() { //v3.0
  var i, args=MM_goToURL.arguments; document.MM_returnValue = false;
  for (i=0; i<(args.length-1); i+=2) eval(args[i]+".location='"+args[i+1]+"'");
}

function MM_validateForm() { //v4.0
  var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
  for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=MM_findObj(args[i]);
    if (val) { nm=val.name; if ((val=val.value)!="") {
      if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
        if (p<1 || p==(val.length-1)) errors+='- '+nm+' must contain an e-mail address.\n';
      } else if (test!='R') { num = parseFloat(val);
        if (isNaN(val)) errors+='- '+nm+' must contain a number.\n';
        if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
          min=test.substring(8,p); max=test.substring(p+1);
          if (num<min || max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n';
    } } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is required.\n'; }
  } if (errors) alert('The following error(s) occurred:\n'+errors);
  document.MM_returnValue = (errors == '');
}