function collapser(ref)
{
	var collapse = document.getElementById(ref);
	var collapse_display = collapse.style.display;
	if (collapse_display == "none") {
		collapse.style.display = "block";	
          	document.getElementById(ref+"_collapse").innerHTML = "<img onmouseover=\"javascript:this.style.cursor='pointer'\" onClick=\"collapser('"+ref+"')\" align=\"absmiddle\" style=\"border: 0px;\" src=\"interface/minus.png\">";
	} else {
		collapse.style.display = "none";	
          	document.getElementById(ref+"_collapse").innerHTML = "<img onmouseover=\"javascript:this.style.cursor='pointer'\" onClick=\"collapser('"+ref+"')\" align=\"absmiddle\" style=\"border: 0px;\" src=\"interface/plus.png\">";		
	}
}