function open_div(div_id_close, div_id_open) {
	
		getObj(div_id_close).style.display = "none";
		getObj(div_id_open).style.display = "block";
			
	}
	
	function open_plate(tab_id, div_id_open) {
	
		getObj(tab_active).className = "tab inactive";
		tab_id.className = "tab active";
		
		getObj(opened_plate).style.display = "none";
		getObj(div_id_open).style.display = "block";
		
		tab_active = tab_id.id;
		opened_plate = div_id_open;
	}
	
	function clear_bg (input_element) {
	
		input_bg_image = input_element.style.backgroundImage;	
		input_element.style.backgroundImage = "none"
	
	}
	function set_bg (input_element) {
		
		if (trim(input_element.value) == "") input_element.style.backgroundImage = input_bg_image;
	
	}
	
	function getObj(id,d)
	{
		var i,x;  if(!d) d=document; 
		if(!(x=d[id])&&d.all) x=d.all[id]; 
		for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][id];
		for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=getObj(id,d.layers[i].document);
		if(!x && document.getElementById) x=document.getElementById(id); 
		return x;
	};
	
	function trim (str) {
		str = str.replace(/^\s+/, '');
		for (var i = str.length - 1; i >= 0; i--) {
			if (/\S/.test(str.charAt(i))) {
				str = str.substring(0, i + 1);
				break;
			}
		}
		return str;
	}