function checksuppdemand()
{
	
	var vbreed = document.aa.breed.value;
	var vtrade_name = document.aa.trade_name.value;
	var varea = document.aa.area.value;
	var vprice = document.aa.price.value;
	var vusername = document.aa.username.value;
	var vemail = document.aa.email.value;
	var vtel = document.aa.tel.value;
	
	
	if(vbreed == "")
	{
		alert("Please choose variety!");
		document.aa.breed.focus();
		return false;	
	}
	else if(vtrade_name == "")
	{
		alert("Please input name!");
		document.aa.trade_name.focus();
		return false;	
	}
	else if(varea == "")
	{
		alert("Please input location!");
		document.aa.area.focus();
		return false;	
	}
	else if(vprice == "")
	{
		alert("Please input price!");
		document.aa.price.focus();
		return false;	
	}
	//else if( !iffloat(vprice) )
	//{
	//	alert("Please input valid price!");
	//	document.aa.price.focus();
	//	return false;	
	//}
	else if(vusername == "")
	{
		alert("Please input your name!");
		document.aa.username.focus();
		return false;
	}
	else if(vemail == "")
	{
		alert("Please input email!");
		document.aa.email.focus();
		return false;	
	}
	else if(vemail.indexOf("@")<=0)
	{
		alert("Please input valid email!");
		document.aa.email.focus();
		return false;	
	}
	else if(vtel == "")
	{
		alert("Please input tel!");
		document.aa.tel.focus();
		return false;	
	}
	
}