function open_popup_window(win_url,win_name,win_width,win_height,win_resizable,win_scrollbars){

	var win_left = (screen.width)?(screen.width-win_width)/2:0;
	var win_top = (screen.height)?(screen.height-win_height)/2:0;
	var win_features = '';

	win_features = 'screenX=' + win_left + ',';
	win_features+= 'screenY=' + win_top + ',';
	win_features+= 'left=' + win_left + ',';
	win_features+= 'top=' + win_top + ',';
	win_features+= 'width=' + win_width + ',';
	win_features+= 'height=' + win_height + ',';
	win_features+= 'resizable=' + ((win_resizable)?'yes':'no') + ',';
	win_features+= 'scrollbars=' + ((win_scrollbars)?'yes':'no') + ',';
	win_features+= 'toolbar=no,directories=no,status=no,menubar=no,location=no';

	popup_window = window.open(win_url,win_name,win_features);

	focus_window(popup_window);

}
function focus_window(obj){

	if(window.focus){

		obj.focus();

	}

}
function is_empty(val){

	var i;

	if(val.length == 0 || val == null || val == ''){

		return true;

	}else{

		for(i=0;i<val.length;i++){

			if(val.charAt(i) != ' '){

				return false;

			}

		}

	}

	return true;

}