onclick is not a function : Im trying to make a image to change depending on which field in the form that is active and the first (collar()) works and i copied and tried it for the next field (chest()) it says that isnt a function whats wrong?

    <input type="text" name="collar" placeholder="Collar" onclick="collar()"/>
    <input type="text" name="chest" placeholder="Chest" onclick="chest()"/>

here is the javascript

    function collar()
{

	var image=document.getElementById('theImage')
	if(image_tracker=='upperbody' || 'chest' || 'waist' || 'under' || 'lenght' || 'shoulder' )
	{
		image.src="collar.png";
		image_tracker = 'collar';
	}
	else {
		{
			image.src = "överkropp.png";
			image_tracker = 'upperbody'
		}
	}
}

function chest()
{

	var image=document.getElementById('theImage')
	if(image_tracker=='upperbody' || 'collar' || 'waist' || 'under' || 'lenght' || 'shoulder' )
	{
		image.src="http://www.anatomyatlases.org/firstaid/images/suckingthoraxwoundB.jpg";
		image_tracker = 'chest';
	}
	else {
		{
			image.src = "överkropp.png";
			image_tracker = 'upperbody'
		}
	}
}

