document.getElementById("hdr").innerHTML= "<table align=center>" +
"<tr><td align='center'><img src='LogoTT.png'></td></tr>" +
											"<tr><td>" +
												"<table id='nvbar'>" +
													"<tr>" +
													"<td><a href='index.html'>Home</a></td>" +
													"<td><a href='SoftTest.html' onmouseover='mopen(\"m1\")' onmouseout='mclosetime()'>Software Testing</a>" +
													"<div id='m1' onmouseover='mcancelclosetime()' onmouseout='mclosetime()'>" +
														"<a href='TestModels.html'>Testing Models</a>" +
														"<a href='TDLC.html'>Testing & SDLC</a>" +
														"<a href='TestTypes.html'>Testing Types</a>" +
														"<a href='TestTech.html'>Testing Techniques</a>" +
														"</div>" +
													"</td>" +
													"<td><a href='TestMetrics.html'>Testing Metrics</a></td>" +
													"<td><a href='Defect.html'>Defect Management</a></td>" +
													"<td><a href='TestTools.html'>Testing Tools</a></td>" +
													"</tr>" +
												"</table>" +
											"<div style='clear:both'></div>" +
											"</td></tr>" +
											"</table>"
											



var timeout	= 500;
var closetimer	= 0;
var ddmenuitem	= 0;

// open hidden layer
function mopen(id)
{	
	// cancel close timer
	mcancelclosetime();

	// close old layer
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	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';

}
// close showed layer
function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// go close timer
function mclosetime()
{
	closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer
function mcancelclosetime()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}

// close layer when click-out
document.onclick = mclose;