var positions = '';
$.each($('input:checkbox:checked')
,function(i,item){
positions+=$(item).val()+',';
})
if(positions){
positions = positions.substring(0,positions.length-1)
}
var positions = '';
$.each($('input:checkbox:checked')
,function(i,item){
positions+=$(item).val()+',';
})
if(positions){
positions = positions.substring(0,positions.length-1)
}