function D_ltrim(s) {     return s.replace(/^\s+/, ""); 
}  
function D_rtrim(s) {     return s.replace(/\s+$/, ""); 
}  
function D_trim(s) {     return D_rtrim(D_ltrim(s)); 
}

function D_otrim(ob) {     ob.value=D_trim(ob.value); 
}

function trim(cadena){
cadena2 = "";
len = cadena.length;
for ( var i=0; i <= len ; i++ ) if ( cadena.charAt(i) != " " ){cadena2+=cadena.charAt(i); }
return cadena2;
}

function valEmail(valor){
    re=/^[_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*(.[a-z]{2,3})$/
    if(!re.exec(valor))    {
        return false;
    }else{
        return true;
    }
}