function setColor(el, bg) 
{
    if (el.style) el.style.backgroundColor = bg;
}

function checkInput(form) 
{
	var bgBad = "#68CBF0";
	var bgGood = "#FFFFFF";
	var valid = true;

	if (form.name.value == "") 
	{
	    valid = false;
	    setColor(form.name, bgBad);
	} 
	else
	{
	    setColor(form.name, bgGood);
	}

	if (form.age.value == "")
	{
		valid = false;
		setColor(form.age, bgBad);
	}
	else
	{
		setColor(form.age, bgGood)
	}

	if (form.sex.value == "")
	{
		valid = false;
		setColor(form.sex, bgBad);
	}
	else
	{
		setColor(form.sex, bgGood)
	}

	if (form.email.value.length == "" || form.email.value.length < 6 || form.email.value.indexOf("@")== -1 || form.email.value.indexOf(".")== -1) 
	{
	    valid = false;
	    setColor(form.email, bgBad);
	} 
	else 
	{
	    setColor(form.email, bgGood);
	}

	if (form.phone.value == "")
	{
		valid = false;
		setColor(form.phone, bgBad);
	}
	else
	{
		setColor(form.phone, bgGood)
	}

	if (form.section.value == 0)
	{
		valid = false;
		setColor(form.section, bgBad);
	}
	else
	{
		setColor(form.section, bgGood)
	}

	return valid;
}