Help whit on_rez. Syntax error

i wana make so when ive rezzing a prim whit this script in it it shall say "Starting..." here is the code: there is something wrong on the line whit the on_rez

key owner; //Made by Snake Ornitz. Testing how prims can take and send commands.

default 
{
    state_entry() 
    { 
    on_rez(integer start_param)    
    owner=llGetOwner(); 
    llListen(0,"",owner,"");
} 
listen(integer channel, string name, key id, string message) 
    { 
    if(message=="Die") 
    { 
        llDie(); 
    } else 
    if(message=="Colorb") 
    { 
    llSetColor(<0.0, 0.0, 1.0>, ALL_SIDES); 
    } else 
    if(message=="Colorr") 
    { 
    llSetColor(<1.0, 0.0, 0.0>, ALL_SIDES); 
    } else 
    if(message=="Colorg") 
    { 
    llSetColor(<0.0, 1.0, 0.0>, ALL_SIDES); 
    }
    if (start_param !=0)
    {
    llWhisper("Starting up..");
    }
}
}

on_rez is an event just like state_entry or listen, so make sure it's not in another event.

But now ive getting syntax error on that line ill writen the on_rez:

key owner; //Made by Snake Ornitz. Testing how prims can take and send commands.

default 
{
    state_entry() 
    {     
    owner=llGetOwner(); 
    llListen(0,"",owner,"");
} 
listen(integer channel, string name, key id, string message) 
    { 
    if(message=="Die") 
    { 
        llDie(); 
    } else 
    if(message=="Colorb") 
    { 
    llSetColor(<0.0, 0.0, 1.0>, ALL_SIDES); 
    } else 
    if(message=="Colorr") 
    { 
    llSetColor(<1.0, 0.0, 0.0>, ALL_SIDES); 
    } else 
    if(message=="Colorg") 
    { 
    llSetColor(<0.0, 1.0, 0.0>, ALL_SIDES); 
    }
    on_rez(integer start_param);
    {
    if (start_param !=0)
    {
    llWhisper("Starting up..");
    }
}

ok first remove the semi-colon from the event declaration. And you are missing a couple of closing curly-braces. Also the brace issue, it's much easier to notice them when you use consistant even blocking like so . . . (the syntax errors should be fixed also, though can't get into game to test)

key owner; //Made by Snake Ornitz. Testing how prims can take and send commands.

default 
{
    state_entry() 
    {     
		owner=llGetOwner(); 
		llListen(0,"",owner,"");
	}
	
	listen(integer channel, string name, key id, string message) 
    { 
		if(message=="Die") 
		{ 
			llDie(); 
		}
		else if(message=="Colorb") 
		{ 
			llSetColor(<0.0, 0.0, 1.0>, ALL_SIDES); 
		}
		else if(message=="Colorr") 
		{ 
			llSetColor(<1.0, 0.0, 0.0>, ALL_SIDES); 
		}
		else if(message=="Colorg") 
		{ 
			llSetColor(<0.0, 1.0, 0.0>, ALL_SIDES); 
		}
	}
		
    on_rez(integer start_param)
    {
		if (start_param !=0)
		{
			llWhisper("Starting up..");
		}
	}
}