function EsNumerico(exp_validar) {

	var numeros = "0123456789";
	
	if (exp_validar.length==0)return(false);

	for (var n=0; n < exp_validar.length; n++){
		if(numeros.indexOf(exp_validar.charAt(n))==-1)return(false);	
	}
	return(true);
}

function checkForInt(evt) {
  //notice that the check is != null now, as the tab key has a value of 0
  var charCode = ( evt.which != null ) ? evt.which : event.keyCode
  //charCodes < 32 include tab, delete, arrow keys, etc
  return (charCode < 32 || (charCode >= 48 && charCode <= 57))
};

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