diff --git a/plantuml_codeblock_parse.js b/plantuml_codeblock_parse.js
index 19dc95d..ea07e8e 100644
--- a/plantuml_codeblock_parse.js
+++ b/plantuml_codeblock_parse.js
@@ -3,9 +3,9 @@ var plantumlBasePath = "http://www.plantuml.com/plantuml/img/"
 
 var codeBlocks = document.getElementsByClassName("language-plantuml");
 
-for (var i = 0; i < codeBlocks.length; i++) {
-	s = codeBlocks[i].innerHTML
+for (var block_i = 0; block_i < codeBlocks.length; block_i++) {
+	block_string = codeBlocks[block_i].innerText
 	//UTF8
-	s = unescape(encodeURIComponent(s));
-	codeBlocks[i].innerHTML = "<img src=\"" + plantumlBasePath + encode64(zip_deflate(s, 9)) + ">";
+	block_string = unescape(encodeURIComponent(block_string));
+	codeBlocks[block_i].innerHTML = "<img src=\"" + plantumlBasePath + encode64(zip_deflate(block_string, 9)) + "\">";
 }