diff --git a/app/extensions/extension_download.php b/app/extensions/extension_download.php
index 064bfd1e99..5255311fc8 100644
--- a/app/extensions/extension_download.php
+++ b/app/extensions/extension_download.php
@@ -152,7 +152,7 @@ $row_style["1"] = "row_style1";
 	echo "<table class='tr_hover' width='100%' border='0' cellpadding='0' cellspacing='0'>\n";
 	echo "<tr>\n";
 		echo "<tr>\n";
-		echo "<th><input type=\"checkbox\" id=\"selecctall\"/>";
+		echo "<th><input type=\"checkbox\" id=\"selectall\" onclick=\"checkbox_toggle();\"/></th>\n";
 		echo "</th>";
 		echo "<th> Column Name";
 		echo "</th>";
@@ -183,6 +183,23 @@ $row_style["1"] = "row_style1";
 	echo "<br><br>";
 	echo "</form>";
 
+	//define the checkbox_toggle function
+	echo "<script type=\"text/javascript\">\n";
+	echo "	function checkbox_toggle(item) {\n";
+	echo "		var inputs = document.getElementsByTagName(\"input\");\n";
+	echo "		for (var i = 0, max = inputs.length; i < max; i++) {\n";
+	echo "			if (inputs[i].type === 'checkbox') {\n";
+	echo "				if (document.getElementById('selectall').checked == true) {\n";
+	echo "				inputs[i].checked = true;\n";
+	echo "			}\n";
+	echo "				else {\n";
+	echo "					inputs[i].checked = false;\n";
+	echo "				}\n";
+	echo "			}\n";
+	echo "		}\n";
+	echo "	}\n";
+	echo "</script>\n";
+
 //include the footer
 	require_once "resources/footer.php";
 ?>