function browseBy(self, target){
	var targetSelectSenator=document.getElementById(target + "SelectSenator");
	var targetSelectState=document.getElementById(target + "SelectState");
	var targetSelectIssue=document.getElementById(target + "SelectIssue");
	var targetSelect=document.getElementById(target + "Select" + self.value);
	// i clear all the selects
	targetSelectSenator.style.display="none";
	targetSelectState.style.display="none";
	targetSelectIssue.style.display="none";
	// i display the target select
	targetSelect.style.display="inline";
}