@mixin block(){
  cursor: pointer;
  display: inline-block;
  *display: inline;
  *zoom:1
}

@mixin border-radius($sizing){
  -webkit-border-radius:$sizing;
  -moz-border-radius:$sizing;
  border-radius:$sizing;
}

@mixin box-sizing ($sizing) {
  -webkit-box-sizing:$sizing;
  -moz-box-sizing:$sizing;
  box-sizing:$sizing;
}

@mixin center($width){
  left: 50%;
  margin-left: -$width/2;
}