function clearInput(field_id, term_to_clear) {
	
	// Clear input if it matches default value
	if (document.getElementById(field_id).value == term_to_clear ) {
		document.getElementById(field_id).value = '';
	}
	
	// If the value is blank, then put back term
	else if (document.getElementById(field_id).value == '' ) {
		document.getElementById(field_id).value = term_to_clear;
}

function skimImage(topthing, bottomthing) {

	var g = document.getElementById(topthing);
	var f = document.getElementById(bottomthing);
	
	g.onmousemove = function(e){
			e = e || window.event;
			var x = getMouseX(e);		
			var image = Math.floor(x / 50) % 3;
			f.style.backgroundPosition = "0pt " + (-160 * image) + "px";
		}
	}
			
	function getMouseX(e){
		var posx = 0;
		if (e.pageX != undefined) 	{
			posx = e.pageX;
		}
		else if (e.clientX != undefined) 	{
			posx = e.clientX + document.body.scrollLeft
				+ document.documentElement.scrollLeft;
		}
		return posx;
	}
	
	function getMouseY(e){
		var posx = 0;
		if (e.pageY != undefined) 	{
			posx = e.pageY;
		}
		else if (e.clientY != undefined) 	{
			posx = e.clientY + document.body.scrollLeft
				+ document.documentElement.scrollLeft;
		}
		return posx;
	}

}