function isblank(s)
{
    for(var i = 0; i < s.length; i++) {
        var c = s.charAt(i);
        if ((c != ' ') && (c != '\n') && (c != '\t')) return false;
    }
    return true;
}

function Change_Menu(controlname)
{
	controlname.className="ChangeBackground";
	controlname.style.cursor="hand";
}

function Change_Menu_Back(controlname)
{
	controlname.className="ChangeBackground_Back";
	controlname.style.cursor="default";
}
//function to check if user has input the word for search. 
function check_search()
{
	if (isblank(document.frm_search.Search.value))
	{
		alert("Please input the keywords you want to search!");
		document.frm_search.Search.focus();
		return false;
	}
	document.frm_search.submit();
	return true;
}
//end of function


function Change_Bg(controlname)
{
	controlname.className="for_submit_hover";
	controlname.style.cursor="hand";
}

function Change_Bg_Back(controlname)
{
	controlname.className="for_submit";
	controlname.style.cursor="default";
}

function Change_Bg_Login(controlname)
{
	controlname.className="for_submit_login_hover";
	controlname.style.cursor="hand";
}

function Change_Bg_Login_Back(controlname)
{
	controlname.className="for_submit_login";
	controlname.style.cursor="default";
}