function precarga() {
	if (!document.images) return;
	var ar = new Array();
	var arguments = precarga.arguments;
	for (var i = 0; i < arguments.length; i++) {
		ar[i] = new Image();
		ar[i].src = arguments[i];
	}
}

function cambia(obj, flag) {
	if (flag=='on') {
		obj.style.backgroundImage = obj.style.backgroundImage.replace('0','1'); 
		obj.className='textoBotones2';
		obj.getElementsByTagName("a").item(0).className='textoBotones2';
	} else {
		obj.style.backgroundImage = obj.style.backgroundImage.replace('1','0'); 
		obj.className='textoBotones';	
		obj.getElementsByTagName("a").item(0).className='textoBotones';
	}
}

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_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+='- El formato del E-mail introducido no es correcto.\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 = '- Los campos Nombre, E-Mail y Mensaje son obligatorios.\n'; }
  } if (errors) alert('Error:\n\n'+errors);
  document.MM_returnValue = (errors == '');
}