diff --git a/src/func/check_url b/src/func/check_url
new file mode 100644
index 0000000..53b23e0
--- /dev/null
+++ b/src/func/check_url
@@ -0,0 +1,20 @@
+#!/bin/bash
+#remaster lib
+[ -d "<LIBDIR>" ] || { echo "LIBDIR not exist"; exit 1; }
+
+#check_url [URL]
+function check_url() {
+    URL="$1"
+    if [[ `wget -S --spider "$URL"  2>&1 | grep 'HTTP/1.1 200 OK'` ]]; then
+      echo "true"
+      return 0
+    else
+      echo "false"
+      return 1
+    fi
+}
+
+#this func is standalone executable
+[ -n "$1" ] && {
+    check_url $@
+}
diff --git a/src/func/iso_extract b/src/func/iso_extract
index ab6c6df..d89ff28 100755
--- a/src/func/iso_extract
+++ b/src/func/iso_extract
@@ -15,18 +15,26 @@ function iso_extract() {
 		return 10
 	}
 
-	iso_source="$1"
-	[ -f "$iso_source" ] || {
-		echo "### ERROR ### iso_extract: ISO \"$iso_source\" not exist!"
-		return 11
-	}
-
 	iso_extr_dir="$2"
 	[ -d "$iso_extr_dir" ] || {
 		echo "### ERROR ### iso_extract: aim directory not exist!"
 		return 12
 	}
 
+	iso_source="$1"
+	[ -f "$iso_source" ] || {
+		#if it is an url...
+		if [ "`check_url $iso_source`" == "true" ]; then
+			#dl to tmp + set iso_source
+			iso_tmp="`mktemp --suffix=.iso`"; rm "$iso_tmp"
+			wget -O "$iso_tmp" "$iso_source"
+		else
+			echo "### ERROR ### iso_extract: ISO \"$iso_source\" not exist!"
+			return 11
+		fi
+	}
+
+
 	#mace tmp mountpoint
 	tmpdir="`mktemp -d`"
 	[ -d "$iso_extr_dir" ] && {
@@ -41,6 +49,7 @@ function iso_extract() {
 	#clear tmp mountpoint
 	umount "$iso_source"
 	rm -r "$tmpdir"
+	[ -n "$iso_tmp" ] && rm "$iso_tmp"
 	tmpdir=
 
 	echo "done"