// Toggle an element's Display property
function getEl(id) 
{ 
	return document.getElementById(id); 
}
function showhide(id) 
{ 
	getEl(id).style.display =  getEl(id).style.display == 'none' ? '' : 'none'; 
}
// Open 800x500 Popup
function doWin(winURL) {
        var settings = "";
        var win = null;
        var w = 800;
        var h = 500;
        LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
        TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
        settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars,bar,toolbar,sizeable';
        win = window.open(winURL,"myname",settings);
}