var hh=0;
var inter;
function ShowBox()
{ 
//Depending on the amount of text, set the maximum height here in pixels
     if(hh==30)
     {
     clearInterval(inter);
     return;
     }
 
     obj = document.getElementById("nav_menu");
     obj.style.visibility = 'visible';
     hh+=2;
     obj.style.height = hh + 'px';
	 show_hide_div('open_id', 'close_id');
	
}
function HideBox()
{
     obj = document.getElementById("nav_menu");
	 //alert(obj.style.height);
 
     if(hh==2)
     {
     obj.style.visibility = 'hidden';
     obj.style.height = '0.1em';
     clearInterval(inter);
     return;
     }
     hh-=2;
     obj.style.height = hh + 'px';
	 show_hide_div('close_id', 'open_id');
}
function brwoser_type()
{	 
	 var browser=navigator.appName;
	 var b_version=navigator.appVersion;
	 var version=parseFloat(b_version);
	 alert(browser+"+"+version);
}
function show_hide_div(hide_div, show_div)
{
	document.getElementById(hide_div).style.display = "none";
	document.getElementById(show_div).style.display = "block";
}