Inspired by the script posted by desga2 (http://kmeleonbrowser.org/forum/read.php?1,79289)
I tried to make a similar script for megavideo.com.
when right clicking on a megavideo link (for example from letmewatchthis.com),and then clicking Open Megavideo, it will open a new tab in k-meleon and no ad just the player, no java needed, as mentioned on the page linked above:

# K-Meleon Macros (http://kmeleon.sourceforge.net/wiki/index.php?id=MacroLanguage)

# ---------- Only MegaVideo videos without JS ----------------------------
#
# Dependencies        : -
# Resources        : -
# Preferences        : -
#
# ----------------------------------------------------------------------

MegaVideo_Video{
$_video_addres="";
$_video_addres=gsub("?","",$LinkURL);
$_video_addres=gsub("=","/",$_video_addres);
opentab($_video_addres);
}

# ----- PRIVATE

_MegaVideo_Video_BuildMenu{
# Link Popup context menu
$__m=_("Open &MegaVideo Video");
setmenu(LinkOpenExternal,macro,$__m,MegaVideo_Video);
}

$OnInit=$OnInit."_MegaVideo_Video_BuildMenu;";

# -----------------------------------------------------------------------
$macroModules=$macroModules."MegaVideo_Video;";

hope you enjoy this

NOTE: if you want a new window for the video player, then change the "opentab" in the script with "opennew".