function removeLeadingAndTrailingChar (inputString, removeChar){
	var returnString = inputString;
	if (removeChar.length){
	  	while(''+returnString.charAt(0)==removeChar){
		  returnString=returnString.substring(1,returnString.length);
		}
		while(''+returnString.charAt(returnString.length-1)==removeChar){
	    	returnString=returnString.substring(0,returnString.length-1);
	  	}
	}
	return returnString;
}

function vmail(texto){
    var mailres = true;
    var cadena = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890@._-";
    var arroba = texto.indexOf("@",0);
    if ((texto.lastIndexOf("@")) != arroba) arroba = -1;
    var punto = texto.lastIndexOf(".");
    for (var contador = 0 ; contador < texto.length ; contador++){
        if (cadena.indexOf(texto.substr(contador, 1),0) == -1){
            mailres = false;
            break;
     	}
    }
    if ((arroba > 1) && (arroba + 1 < punto) && (punto + 1 < (texto.length)) && (mailres == true) && (texto.indexOf("..",0) == -1)) mailres = true;
    else mailres = false;
    return mailres;
}

function esEnter(e){
	var keynum;
	var numcheck;
	if(window.event) // IE
	{
		keynum = e.keyCode;
	}
	else if(e.which) // Netscape/Firefox/Opera
	{
		keynum = e.which;
	}
	return (keynum==13);
}