function change_value(obj){
		if(!obj._haschanged){	
			obj.value=''; obj._haschanged=true; 
			obj.className += hover_class; 
			} 
		else if ((obj._haschanged) && (obj.value==='')) { 
			obj.value=sf_text; obj._haschanged=false; 
			obj.className += hover_class;	
			}
	}
	function value_back(obj){
		if ((obj._haschanged) && (obj.value==='')) { 
		obj.value=sf_text; obj._haschanged=false; 
		obj.className = old_class;
		}
	}
	function value_chck(obj_sf,obj_form){
	
		var this_sf = document.getElementById(obj_sf);

		if ((this_sf.value==sf_text) || (this_sf.value==='')){
			this_sf.value='';
		}
		
			
		
	}