var saNowSelect = 'air';


function saChg(target) {
	
	var saExpForm = document.getElementById('sfExp');
	var saAirForm = document.getElementById('sfAir');
	
	var saExpTab = document.getElementById('tabExpA');
	var saAirTab = document.getElementById('tabAirA');
	
	var saFormBox = document.getElementById('saForm');

	switch (target) {
	
		case 'exp':
			saExpForm.style.display = "block";
			saAirForm.style.display = "none";
			saExpTab.style.backgroundImage = ('url(../img/saTab_on.png)');
			saAirTab.style.backgroundImage = ('url(../img/saTab_out.png)');
			saFormBox.style.backgroundImage = ('url(../img/saBox_exp.png)');
			saNowSelect = 'exp'
		break;
		
		case 'air':
			saExpForm.style.display = "none";
			saAirForm.style.display = "block";
			saAirTab.style.backgroundImage = ('url(../img/saTab_on.png)');
			saExpTab.style.backgroundImage = ('url(../img/saTab_out.png)');
			saFormBox.style.backgroundImage = ('url(../img/saBox_air.png)');
			saNowSelect = 'air'
		break;
		
		
	}
	
}

function saTabOver(status,tab) {
	
	var saExpTab = document.getElementById('tabExpA');
	var saAirTab = document.getElementById('tabAirA');
	
	switch (saNowSelect) {
		
		case 'exp':
		
			if (tab == 'exp') {
				saExpTab.style.backgroundImage = ('url(../img/saTab_on.png)');
			}
			
			if (tab == 'air') {
				
				switch (status) {
				
					case 'over':
						saAirTab.style.backgroundImage = ('url(../img/saTab_over.png)');
					break
					
					case 'out':
						saAirTab.style.backgroundImage = ('url(../img/saTab_out.png)');
					break;
				
				}
			}
		
		break;
		
		case 'air':
		
			if (tab == 'air') {
				saAirTab.style.backgroundImage = ('url(../img/saTab_on.png)');
			}
			
			if (tab == 'exp') {
				
				switch (status) {
				
					case 'over':
						saExpTab.style.backgroundImage = ('url(../img/saTab_over.png)');
					break
					
					case 'out':
						saExpTab.style.backgroundImage = ('url(../img/saTab_out.png)');
					break;
				
				}
			}
		
		break;
		
	}
	
	
}