function checkform(){
	
		
		
		var theform = document.forms['theform'];
		
		var cf1 = document.getElementById('cf1');
		var cf2 = document.getElementById('cf2');
		var cf3 = document.getElementById('cf3');
		var cf4 = document.getElementById('cf4');
		
		var email_addr = document.getElementById('email_addr');
		
		var pwregex = /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i;

		
		if(email_addr.value == ''){
			
			alert ('Please type your email address.');
			return false;
			
		}
		
		if (!email_addr.value.match(pwregex)){
		  
			alert ('Password must be containing 8 or more characters, a-z, A-Z, 0-9.');
				
			return false;
			  
		}
		
		cf3.value = cf1.value+cf2.value;
		
		if (cf3.value == cf1.value+cf2.value && cf4.value == '') {
			
			theform.submit();
			return true;
			
		}
	
	
}