String.prototype.trim = function() {
	var a = this.replace(/^\s+/, '');
	return a.replace(/\s+$/, '');
};

function SomenteNumeros(eventObj) {

    var keyCode = null;
    if (document.all) {
        keyCode = eventObj.keyCode;
    }
    else {
        keyCode = eventObj.which;
    }

    return ((keyCode > 47 && keyCode < 58) || (keyCode == 8) || (keyCode == 0));
    
}