function CheckNumbers(obj) {
var text = obj.value;
if(isNaN(text)==true){
obj.value=oldstring;
}else {
oldstring=text;
if(text=="" || text=="undefined") {
text="";
}
}
}

function showIt(obj) {
if (document.getElementById)
{document.getElementById(obj).style.visibility = "visible";}
else
{if (document.layers)
{document.layers[obj].visibility = "show";}
else
{document.all(obj).style.visibility = "visible";}
}
}

function hideIt(obj) {
if (document.getElementById)
{document.getElementById(obj).style.visibility = "hidden";}
else
{if (document.layers)
{document.layers[obj].visibility = "hide";}
else
{document.all(obj).style.visibility = "hidden";}
}
}

function flip(divid)
{
if (document.getElementById(divid).style.display=='none')
	{
		document.getElementById(divid).style.display='';
	}
	else
	{
			document.getElementById(divid).style.display='none';
	}
}