function tabit(tabName,btnId,tabNumber,styleName){
for(i=0;i<tabNumber;i++){
	document.getElementById(tabName+"_div"+i).style.display = "none";
	document.getElementById(tabName+"_btn"+i).className = styleName+"_off";
};
	document.getElementById(tabName+"_div"+btnId).style.display = "";
	document.getElementById(tabName+"_btn"+btnId).className = styleName+"_on";
};