function display_image(nameofdiv){
		if(nameofdiv=="ps"){
			document.getElementById("img_div_ps").style.visibility="visible";
		}
		if(nameofdiv=="ss"){
			document.getElementById("img_div_ss").style.visibility="visible";
		}
		if(nameofdiv=="bi"){
			document.getElementById("img_div_bi").style.visibility="visible";
		}
		if(nameofdiv=="fr"){
			document.getElementById("img_div_fr").style.visibility="visible";
		}
		if(nameofdiv=="ce"){
			document.getElementById("img_div_ce").style.visibility="visible";
		}
}


function hide_image(nameofdiv){
		if(nameofdiv=="ps"){
			document.getElementById("img_div_ps").style.visibility="hidden";
		}
		if(nameofdiv=="ss"){
			document.getElementById("img_div_ss").style.visibility="hidden";
		}
		if(nameofdiv=="bi"){
			document.getElementById("img_div_bi").style.visibility="hidden";
		}
		if(nameofdiv=="fr"){
			document.getElementById("img_div_fr").style.visibility="hidden";
		}
		if(nameofdiv=="ce"){
			document.getElementById("img_div_ce").style.visibility="hidden";
		}
}