win_num = 0;
ua = navigator.userAgent;
win_msie = ((ua.indexOf("Win") >= 0) && (ua.indexOf("MSIE") >= 0))
function new_win(win_url,win_name) {

// optional 3rd param = max_width
// optional 4th param = max_height

	// if no window name is given, craete one to ensure a new window opens
	if (win_name == '' || win_name == '_new') {
		win_nm = 'new_win_' + win_num;
		win_num = win_num + 1;
	} else {
		win_nm = win_name;
	}

	//if (win_msie) {
	//	win_nm = win_name + win_num;
	//	win_num = win_num + 1;
	//} else { win_nm = win_name; }

	if (arguments.length >= 3) { max_width=arguments[2]; } else { max_width=600; }
	if (arguments.length >= 4) { max_height=arguments[3]; } else { max_height=450; }
	// alert(max_width);
	// alert(max_height);
	
	left1 = Math.round(screen.availWidth * 0.085);
	top1 = 30;
	w1 = Math.round(screen.availWidth*0.85);
	h1 = Math.round(screen.availHeight*0.85);
	// Math.round((screen.availHeight-200));
	if ((max_width > 0) && (w1 > max_width)) {
		dif1 = w1-max_width;
		left1 = Math.round(left1+(dif1/2));
		w1 = max_width; }
	if ((max_height > 0) && (h1 > max_height)) {
		dif1 = h1-max_height;
		top1 = Math.round(top1+(dif1/2));
		h1 = max_height; }
	win_attr = 'resizable'; // toolbar,menubar
	//win_features = win_attr;
	if (win_attr != '') { win_features = win_attr + ','; } else { win_features = '' }
	if (win_attr.indexOf("left=") < 0) {win_features = win_features+'left='+left1}
	if (win_attr.indexOf("top=") < 0) {win_features = win_features+',top='+top1}
	if (win_attr.indexOf("screenX=") < 0) {win_features = win_features+',screenX='+left1}
	if (win_attr.indexOf("screenY=") < 0) {win_features = win_features+',screenY='+top1}
	if (win_attr.indexOf("width=") < 0) {win_features = win_features+',width='+w1}
	if (win_attr.indexOf("height=") < 0) {win_features = win_features+',height='+h1}

	win = window.open(win_url, win_nm, win_features);
	win.focus();
}