function str_onclick(){
 if(document.getElementById('n_clicked').value=='1'){
	document.getElementById('str_search').value='';
	document.getElementById('n_clicked').value='0';
 }
}
function uname_onclick(){
 if(document.getElementById('u_clicked').value=='1'){
	document.getElementById('uname').value='';
	document.getElementById('upass').value='';
	document.getElementById('u_clicked').value='0';
 }
}