Синтаксис: IsValidSkin(skinid);  skinid - id скина, кторый проверяется. 
 
Code
stock IsValidSkin(skinid)         
 {         
         if(skinid < 0 || skinid >= 3 && skinid <= 6 || skinid ==8 || skinid == 42 || skinid == 65 || skinid == 74 || skinid == 86 || skinid == 119 || skinid == 149 || skinid == 208 skinid == 239 || skinid == 273 || skinid == 289 || skinid >= 300) return 0; 
         else return 1; 
 }
 Автор: [ACF]OKStyle.