function clean_window (target, wname, w, h) {
	
	var useragent = navigator.userAgent.toLowerCase();
	var browser = useragent.indexOf('msie') > 0 ? false : true;	
	
	if (browser) {
		
		var t = window.screenY + 45
		var l = window.screenX + 45
		
	} else {
        
        var t = window.screenTop + 20
		var l = window.screenLeft + 40
		
		if(!opener) {
			
			var t = 40
			var l = 40
		}
	}
    
	w = w == undefined || w < 1 ? 500 : w
	h = h == undefined || h < 1 ? 500 : h
	
	win = window.open (target, wname, 'height=' + h + 'px, width=' + w + 'px, location=no, menubar=yes, resizable=yes, scrollbars=yes, status=no, toolbar=no, top=' + t + 'px, left=' + l + 'px')
    win.focus ()
}