click adds term to filter (before: replace)

public_html/js/functions.js

@@ -109,7 +109,9 @@ function filter(oLink) {
 	oTable=document.getElementsByTagName('table')[0];
 	oSearchfield=document.getElementsByClassName('searchfield')[0];
 	if(oLink.innerHTML){
-		oSearchfield.value = oLink.innerHTML;		
+		oSearchfield.value = oSearchfield.value 
+			? oSearchfield.value + ' ' + oLink.innerHTML 
+			: oLink.innerHTML;		
 	} else {
 		oSearchfield.value = oLink;
 	}