//function parameters are: field - the string field, count - the field for remaining
//characters  number and max - the maximum number of characters
function CountLeft(field, count, max) {
	// if the length of the string in the input field is greater than the max value, trim it
	if (field.value.length > max)
		field.value = field.value.substring(0, max);
	else
		// calculate the remaining characters
		count.value = max - field.value.length;
}

function enviar(t){
	  errores = ""; 

	  esta_vacio(t.textoMail,'EMAIL');
	  
		if(chequea())
		    t.submit();
		else
		  alert("Por favor, escriba algún mensaje para poder enviárselo a su destinatario");		
}