var version4 = (navigator.appVersion.charAt(0) == "4"); 
var popupHandle;

function closePopup() 
{
	if(popupHandle != null && !popupHandle.closed) popupHandle.close();
}

function displayPopup(position,url,name,width,height,evnt)
 {
	//height = window.screen.height*.75;
	//width  = window.screen.width *.75;
	var properties = "toolbar = 0, location = 0, height = " + height;
	properties = properties + ", width=" + width;
	var leftprop, topprop, screenX, screenY, cursorX, cursorY, padAmt;
	properties=properties + ", scrollbars=no, resizable=no, menubar=no,"

	if(navigator.appName == "Microsoft Internet Explorer")
	{
		screenY = window.screen.availHeight;
		screenX = window.screen.availWidth;
	}
	else
	{
		screenY = window.outerHeight
		screenX = window.outerWidth
	}

	if(position == 1)
	{
		cursorX = evnt.screenX;
		cursorY = evnt.screenY;
		padAmtX = 10;
		padAmtY = 10;
		if((cursorY + height + padAmtY) > screenY)
		{
			padAmtY = (-30) + (height * -1);
		}
		if((cursorX + width + padAmtX) > screenX)
		{
			padAmtX = (-30) + (width * -1);	
		}
		if(navigator.appName == "Microsoft Internet Explorer") 
		{
			leftprop = cursorX + padAmtX;
			topprop = cursorY + padAmtY;
		}
		else
		{
			leftprop = (cursorX - pageXOffset + padAmtX);
			topprop = (cursorY - pageYOffset + padAmtY);
	   	}
	}
	else
	{
		leftvar = (screenX - width) / 2;
		rightvar = (screenY - height) / 2;
		if(navigator.appName == "Microsoft Internet Explorer")
		{
			leftprop = leftvar;
			topprop = rightvar;
		}
		else
		{
			leftprop = (leftvar - pageXOffset);
			topprop = (rightvar - pageYOffset);
		}
	}
	
	if(evnt != null)
	{
		properties = properties + ", left = " + leftprop;
		properties = properties + ", top = " + topprop;
	}
	closePopup();
	popupHandle = window.open(url,name,properties);
}