function showHide(divtohide){
	if(document.getElementById(divtohide).style.display == "block"){
		document.getElementById(divtohide).style.display = "none";
		if(divtohide == "featuresdiv"){
			document.features.src = 'images/features_expand.gif';
		}else{
			document.technical.src = 'images/technical_expand.gif'; 
		};
	}else{
		document.getElementById(divtohide).style.display = "block";
		if(divtohide == "featuresdiv"){
					document.features.src = 'images/features_collapse.gif'; 
		}else{
				document.technical.src = 'images/technical_collaspe.gif'; 
		};
	};
	var hidden = divtohide;
};