var location_set;
var occupation_set;

function swap(swap_occupation){

	var projects = document.getElementById("projectList");
	var nav = document.getElementById("mainNav");
	var links = nav.getElementsByTagName("a")
	var li = nav.getElementsByTagName("li")
	var properties = projects.getElementsByTagName("a");

		for (var i = 0; i < properties.length; i++) { 
		
		   var properties_occupation = properties[i].getAttribute("name");
		   var properties_occupation2 = properties_occupation.split(",");
		
		   for (var j = 0; j < properties_occupation2.length; j++) {
			  
					properties[i].className = "";
			  
				if (properties_occupation2[j]==swap_occupation){
		
					properties[i].className = "on";
				}
		   }
		}
		occupation_set=swap_occupation;
		   
		//make clicked li "selected"			   
		for (var e=0; e<links.length; e++){
			
			links[e].className = "";	
			if (links[e].getAttribute("name")==swap_occupation){
				//status
				links[e].className = "on";
			}
		}

}