var oSearch; 
var searchText = ""; 

function IsSearchTextEmpty()
{
    if(oSearch.txtSearch.value=='' || oSearch.txtSearch.value==null)
        return true;
    return false;
}

function DoSearch()
{
    oSearch = document.getElementById("topSearchForm");
    if(!IsSearchTextEmpty())
    {
        oSearch.action="/Loading.aspx";
	    oSearch.target="_top";
        oSearch.submit();
    }
    else
        alert("Introduza por favor um texto de pesquisa valido!");
}

function clearSearchText()
{
    oSearch = document.getElementById("topSearchForm");
    oSearch.txtSearch.value = "";
}

function setSearchText()
{
    oSearch = document.getElementById("topSearchForm");
    oSearch.txtSearch.value = searchText;
}

function saveSearchText(value)
{
    if(document.getElementById("topSearchForm").txtSearch.value != '')
        searchText = value;
}