<!--// Desabilitar el boton derecho
function right(e) {
if (navigator.appName == 'Netscape' && 
(e.which == 3 || e.which == 2))
return false;
else if (navigator.appName == 'Microsoft Internet Explorer' && 
(event.button == 2 || event.button == 3)) {
alert("El boton derecho no tiene funcion en esta pagina");
return false;
}
return true;
}
document.onmousedown=right;
document.onmouseup=right;
if (document.layers) window.captureEvents(Event.MOUSEDOWN);
if (document.layers) window.captureEvents(Event.MOUSEUP);
window.onmousedown=right;
window.onmouseup=right;

<!--// Validar las contadores
function textCounter(field,maxlimit ) {
  if ( field.value.length > maxlimit )
  {
    field.value = field.value.substring( 0, maxlimit );
	mayornumber = maxlimit + 1;
    alert( 'Usted puede Ingresar unicamente ' + mayornumber + ' Caracteres');
    return false;
  }
 
}

<!--// Validar Email
function  ValidarEmail(item)
{
    var checkOK = "0123456789-.@abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_";
    var checkStr = item.value;
    var allValid = true;
    var decPoints = 0;
    var posarroba = 0;
    var cantarroba=0;
    var allNum = "";
	
	for (i = 0;  i < checkStr.length;  i++)
	{
    	ch = checkStr.charAt(i);
    	for (j = 0;  j < checkOK.length;  j++)
      		if (ch == checkOK.charAt(j))
        	break;
    	if (j == checkOK.length)
    	{
      		allValid = false;
      		break;
		}
		if(ch == "@"){
		   allNum += "@";
		   posarroba = i;
		   cantarroba ++;
		}
		else if(ch == ".")
		{
			allNum += ".";
			decPoints++;
        }		
		else
		{
			allNum += ch;
		}
	}
	if(cantarroba > 1){
		allValid = false;
	}
	if(cantarroba <1){
		allValid = false;
	}
		
	if(posarroba == 0){
	    allValid = false;
	}
	if(decPoints < 1){
		allValid = false;
	}
	return (allValid);
}
// Validator Terminos y Condiciones