function nc(obj){
var pr;
obj=obj.split('_');n=obj[0];obj=obj[1];if(obj==1){return;}
pr=obj-1;
document.getElementById(n+"_"+pr).className=n+"_"+pr+pr;
}
function mc(obj){
obj=obj.split('_');n=obj[0];obj=obj[1];if(obj==1){return;}
pr=obj-1;
document.getElementById(n+"_"+(obj-1)).className=n+"_"+pr;
}