function openPopup(url, title, opt){
					if (opt!="" && opt!=null) {
						param = opt;
					} else {
						param = "width=800,height=600,status=yes,scrollbars=yes,resizable=yes";
					}
					params = param.split(",");
					var width = 800;
					var height = 600;
					for(i = 0; i < params.length; i++)
					{
            		currentParams = params[i].split("=");
            		if (currentParams.length >= 2)
            		{
              			if (currentParams[0] == 'width')
                			width = currentParams[1];  
              			if (currentParams[0] == 'height')
                			height = currentParams[1];  
            		}
          		}
					var left = ((screen.availWidth - width) / 2) - 20;
		      	var top = ((screen.availHeight - height) / 2) - 80;
					param = param + ",left=" + left + ",top=" + top;
					newWindow = window.open(url,"Window",param);
					newWindow.focus();
				}