diff --git a/static/js/lg.js b/static/js/lg.js
index 1a8b496..4038579 100644
--- a/static/js/lg.js
+++ b/static/js/lg.js
@@ -13,10 +13,13 @@ function change_url(loc){
 function reload(){
 	loc = "/" + request_type + "/" + hosts + "/" + proto;
 	if (request_type != "summary" ){
-		if( request_args != undefined && request_args != ""){
+		if( request_args != undefined && request_args != "" && /^[a-zA-Z0-9.:-\\/]*$/.test(request_args)){
+			$(".request_args").css("border", "");
 			loc = loc + "?q=" + encodeURIComponent(request_args);
 			change_url(loc)
-		} 
+		} else {
+			$(".request_args").css("border", "solid 1px red");
+		}
 	} else {
 		change_url(loc)
 	}
@@ -102,4 +105,3 @@ $(function(){
 
 });
 
-