//-----------------------------
function IsEmail(texto){

    var mailres = true;            
    var cadena = "abcdefghijklmnnopqrstuvwxyzABCDEFGHIJKLMNNOPQRSTUVWXYZ1234567890@._-";
    
    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 IsNumeric(sText)
{
	var ValidChars = "0123456789.";
	var IsNumber=true;
	var Char;
	
	
	for (i = 0; i < sText.length && IsNumber == true; i++) 
	  { 
	  Char = sText.charAt(i); 
	  if (ValidChars.indexOf(Char) == -1) 
		 {
		 IsNumber = false;
		 }
	  }
	return IsNumber;

}
//------------------------
function isURL(s) {
 	var regexp = /http:\/\/[A-Za-z0-9\.-]{3,}\.[A-Za-z]{3}/;
 	return regexp.test(s);
}
//------------------------
/**
*
*  Javascript trim, ltrim, rtrim
*  http://www.webtoolkit.info/
*
**/
 
function trim(str, chars) {
	return ltrim(rtrim(str, chars), chars);
}
 
function ltrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}
 
function rtrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}