make a GSC file and paste this in it
#include maps\mp\_utility;
#include common_scripts\utility;
#include maps\mp\gametypes_zm\_hud_util;
init()
{
level thread onPlayerConnect();
}
onPlayerConnect()
{
level endon( "game_ended" );
for(;;)
{
level waittill( "connected", player);
player.ignore_lava_damage = 1;
}
}