Re-enabled currency selection

ka.php

@@ -222,11 +222,11 @@ Grund für abweichende kontoinhabende Person"></textarea>
 								<input id="a_amount" type="text" name="amount" placeholder="Betrag*"/> 
 							</div>
 							<div class="is-col">
-<select disabled id="a_currency" name="currency" >
+<select id="a_currency" name="currency" >
   <option value="EUR">EUR</option>
   <option value="USD">USD</option>
   <option value="CHF">CHF</option>
-  <option value="BTC">BTC</option>
+  <option value="XBT">XBT</option>
 </select>
 <!--	<input id="a_currency" type="text" name="curreny" placeholder="Waehrung*"/> -->
 							</div>

kaform.js

@@ -35,13 +35,16 @@ function isFloat(val) {
 }
 
 
+/**
+ * grey-out currency iselection if there is at least one document is atatched.
+ */
 function disableCurrency()
 {
 	if (countRows()>0){
 		document.getElementById("a_currency").disabled=true;
 	}
 	else {
-		document.getElementById("a_currency").disabled=true;
+		document.getElementById("a_currency").disabled=false;
 	}
 
 }