STRING* endfile = "#10";

function leveload(STRING *filename)
{
	str_cpy(endfile, filename);
	str_cat(endfile, ".wmb");
	level_load(endfile);
	wait(2);
}


function something()
{
	[...]
	leveload("filename without extention");
	wait_for(leveload);
	[...]
}

STRING* level1_map = "level1.wmb";
STRING* level2_map = "level2.wmb";

function change_map(level)
{
  switch( level )
  {
    case 1: level_load(level1_map); break;
    case 2: level_load(level2_map); break;
    default: break;
  }
}