var firstKey= true;
var tmpKey = 0;

function dayKeyup(evt){
	if (navigator.userAgent.indexOf('MSIE')!= -1) {
		pKey = window.event.keyCode;
	}else {
		pKey = evt.which;
	}
	if ((pKey>47 & pKey<58)||(pKey>95 & pKey<106)) {
	        if (pKey>47 & pKey<58) {
			pKey = pKey-48;
		} else {
			pKey = pKey-96;
		}
  		if (firstKey) {
  		        if(pKey>0 & pKey<4) {
  		        	tmpKey = pKey;
			        document.getElementById("birthday").selectedIndex=pKey-1;
			        firstKey = false;
		  	} else if(pKey>3) {
                                document.getElementById("birthday").selectedIndex=pKey-1;
			} else {
                                document.getElementById("birthday").selectedIndex=0;
		  	}
		} else {
		        tmpKey = 10*tmpKey+pKey;
		        if(tmpKey >31) {
				document.getElementById("birthday").selectedIndex=pKey-1;
			} else {
                	        document.getElementById("birthday").selectedIndex=tmpKey-1;
                                firstKey = true;
			}
		        firstKey = true;
		}
	} else {
	}
}