ie=false
ns=false
op=false

if (window.navigator.userAgent.indexOf('Opera') != -1 ) {
	op = true
} else {
	if (window.navigator.appName.indexOf('Microsoft') != -1 ) {
		ie = true
		}
	}

if (window.navigator.appName.indexOf('Netscape') != -1) {
	ns = true
	}

function wopen(url,w,h,scroll) {
	var sceenx = window.screen.availWidth;
	var sceeny = window.screen.availHeight;
	var x = Math.floor(sceenx/2-w/2)
	var y = Math.floor(sceeny/2-h/2)

	var scrollbar_str = (scroll==true) ? ',scrollbars=yes' : ''
	var menubar_str = (scroll==true) ? ',menubar=yes' : ''

	var w = window.open(url,'w','width='+w+',height='+h+',top='+y+',left='+x+scrollbar_str+menubar_str)
	w.focus();
	}