function vali_date(name)
			{
			
				day=document.getElementById(name+"_day").value;
				month=document.getElementById(name+"_month").value;
				year=document.getElementById(name+"_year").value;
				document.getElementById(name+"_day").options.lenght=-1;
				max_days=31;
				if(month<8&&month%2==0)max_days=30;
				if(month>=8&&month%2==1)max_days=30;
				if(month==2)
				{
					if((year%400==0)||(year%4==0&&year%100!=0))
						max_days=29;
					else
						max_days=28;
				}
				if(max_days<day) day=max_days;
				document.getElementById(name+"_day").options.length=0;
				for(i=0;i<max_days;i++){
				
					document.getElementById(name+"_day").options[i]= new Option((i+1),i+1);
				}
				document.getElementById(name+"_day").value=day;
			}