function addOpenSearch() {
 if (window.external && ("AddSearchProvider" in window.external)) {
   // Firefox 2 and IE 7, OpenSearch
   window.external.AddSearchProvider("http://www.sheetzbox.com/searchspec.xml");
 } else {
   // No search engine support (IE 6, Opera, etc).
   alert("No search engine support");
 }
}

function showBigTN(divName) {
    document.getElementById(divName).style.display = 'block';
}

function hideBigTN(divName) {
    document.getElementById(divName).style.display = 'none';
}

function echeck(str) {
    var at="@";
    var dot=".";
    var lat=str.indexOf(at);
    var lstr=str.length;
    var ldot=str.indexOf(dot);
    if (str.indexOf(at)==-1) return false;
    if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr) return false;
    if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr) return false;
    if (str.indexOf(at,(lat+1))!=-1) return false;
    if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot) return false;
    if (str.indexOf(dot,(lat+2))==-1) return false;
    if (str.indexOf(" ")!=-1) return false;
    return true;
}