function changecurrency(oSelect,oText, targetText) 
	{
 	 	if(oSelect.selectedIndex != -1)  
    	targetText.value = oText.value / oSelect.options[oSelect.selectedIndex].value;				
	}	  

	function confirm_link ( question, url ) {
		if( confirm( question ) ) {
			window.location = url;
		}
	}
	function showMessageBlock(n)
	{
	 	if(document.getElementById(n).style.visibility == 'visible')
	 	{
			document.getElementById(n).style.visibility = 'hidden';	
		}
		else
		{
			document.getElementById(n).style.visibility = 'visible';
		}
	}
	function changeIT(source, main, light)
	{
		var imag = new Image();
		imag.src = "/files/images/normal/"+source;		
		main.src = imag.src;
		light.href = "/files/images/large/"+source;;
	}