Changed the _replaceSelection startEnd arg to be an array;

Create the replaceTexts var;
Extending the replaceText with the options (using the merging functions);
Use the replaceText option for the drawLink and drawImage functions

src/js/simplemde.js

@@ -260,27 +260,26 @@ function toggleOrderedList(editor) {
 	_toggleLine(cm, "ordered-list");
 }
 
-
 /**
  * Action for drawing a link.
  */
 function drawLink(editor) {
 	var cm = editor.codemirror;
 	var stat = getState(cm);
-	_replaceSelection(cm, stat.link, "[", "](http://)");
+   var options = editor.options;
+	_replaceSelection(cm, stat.link, options.replaceTexts.link);
 }
 
-
 /**
  * Action for drawing an img.
  */
 function drawImage(editor) {
 	var cm = editor.codemirror;
 	var stat = getState(cm);
-	_replaceSelection(cm, stat.image, "![](http://", ")");
+   var options = editor.options;
+   _replaceSelection(cm, stat.image, options.replaceTexts.image);
 }
 
-
 /**
  * Action for drawing a horizontal rule.
  */
@@ -399,11 +398,13 @@ function togglePreview(editor) {
 		toggleSideBySide(editor);
 }
 
-function _replaceSelection(cm, active, start, end) {
+function _replaceSelection(cm, active, startEnd) {
 	if(/editor-preview-active/.test(cm.getWrapperElement().lastChild.className))
 		return;
 
 	var text;
+	var start = startEnd[0];
+	var end = startEnd[1];
 	var startPoint = cm.getCursor("start");
 	var endPoint = cm.getCursor("end");
 	if(active) {
@@ -789,6 +790,10 @@ var toolbarBuiltInButtons = {
 	}
 };
 
+var replaceTexts = {
+   link: ["[", "](http://)"],
+   image: ["![](http://", ")"]
+};
 
 /**
  * Interface of SimpleMDE.
@@ -861,6 +866,10 @@ function SimpleMDE(options) {
 	options.parsingConfig = options.parsingConfig || {};
 
 
+	// Merging the replaceTexts, with the given options
+	options.replaceTexts = extend({}, replaceTexts, options.replaceTexts || {});
+
+
 	// Update this options
 	this.options = options;