function checkSearchWord()
{
	var searchword = document.getElementById("searchform_w").value;
	if (searchword.length==0)
	{
		return false;
	}
	var firstchar = searchword.charAt(0);
	if ( (firstchar>="a"&&firstchar<="z") ||
		 (firstchar>="A"&&firstchar<="Z") ||
		 (firstchar>="0"&&firstchar<="9") )
	{
		var ob = document.getElementById("searchform_f");
		ob.value = "num";
		return true;
	}
	else
	{
		var ob = document.getElementById("searchform_f");
		ob.value = "";
		return true;
	}
}