function chkselectFrom(){
		if (form1.selectFrom.selectedIndex!=3){
			form1.selectTo.selectedIndex=3
		}
		else{
			form1.selectTo.selectedIndex=0;
		}
}
function chkselectTo(){
		if (form1.selectTo.selectedIndex!=3){
			form1.selectFrom.selectedIndex=3
		}
		else{
			form1.selectFrom.selectedIndex=0;
		}
}