Well, it won't work in general...
Here's your script:
PHP Code:
//#CLIENTSIDE
function onPlayerChats() {
  if(
player.chat == "/hug"){
  
setani("grab"null);
  }
    if(
player.chat == "/Dance") {
    
player.dir 2;
  
setani("dance",null);
  }
}
    if(
player.chat == "/sit") {
    
setani("sit",null);
  }
    if(
player.chat == "/run") {
    
setani("walk",null);
  }
    if(
player.chat == "/jump") {
    
setani("jump",null);
  }
    if(
player.chat == "/omg") {
    
setani("omg",null);
  } 
As you can see, the if statements are outside the function, so it's supposed to be:
PHP Code:
//#CLIENTSIDE
function onPlayerChats() {
  if(
player.chat == "/hug"){
    
setani("grab"null);
  }
  if(
player.chat == "/Dance") {
    
player.dir 2;
    
setani("dance",null);
  }
  if(
player.chat == "/sit") {
    
setani("sit",null);
  }
  if(
player.chat == "/run") {
    
setani("walk",null);
  }
  if(
player.chat == "/jump") {
    
setani("jump",null);
  }
  if(
player.chat == "/omg") {
    
setani("omg",null);
  }

But also, it's way too many if statements, using switch()case() is better:

PHP Code:
//#CLIENTSIDE
function onPlayerChats() {
  switch(
player.chat) {
    case 
"hug"
      
setani("grab"null);
    break;
    case 
"/dance":
      
player.dir 2;
      
setani("dance",null);
    break;
    case 
"/sit":
      
setani("sit",null);
    break;
    case 
"/run":
      
setani("walk",null);
    break;
    case 
"/jump":
      
setani("jump",null);
    break;
    case 
"/omg":
      
setani("omg",null);
    break;
  }