function drop(var_name)
{
	select=document.getElementById(var_name + '_dropdown');
	x=0;
	y=0;
	while (select.offsetParent && select.offsetParent.style.position!='absolute')
		{
  		x += select.offsetLeft;
  		select=select.offsetParent;
		}
		
	x+=select.offsetLeft;
	
	
	select=document.getElementById(var_name + '_dropdown');
	while (select.offsetParent && select.offsetParent.style.position!='absolute')
		{		
  		y += select.offsetTop;
  		select=select.offsetParent;
		}

		y += select.offsetTop + document.getElementById(var_name + '_dropdown').clientHeight - 1;	    
    
	if(navigator.userAgent.indexOf('Gecko')!= -1)
	{
    x+=1;
    y+=1;
  }
    	
		document.getElementById('drop_'+var_name).style.left=x + 'px';
		document.getElementById('drop_'+var_name).style.top=y + 'px';
		
	if (document.getElementById('drop_'+var_name).style.display=='')
	{
		document.getElementById('drop_'+var_name).style.display='none';
	}
	else
	{
		document.getElementById('drop_'+var_name).style.display='';
	}
}

function change(var_name,var_value,label)
{
	document.getElementById(var_name+'_text').value = label;
	document.getElementById(var_name).value = var_value;
	clear();

}

function clear()
{
		dropdowns=document.getElementsByTagName('div');
		for (i=0;i<dropdowns.length;i++)
		{
			if (String(dropdowns[i].id).substr(0,5) == 'drop_')
				dropdowns[i].style.display='none';
		}

}