function showNav(img,credit_top,credit_left,credit_height,credit_width) {	var nav_div_name = 'nav_previous';	var nav_div_name2 = 'nav_next';	c = document.getElementById(nav_div_name);	d = document.getElementById(nav_div_name2);	imgHeight = (img.getAttribute('height')) ? img.getAttribute('height') : img.height;	imgWidth  = (img.getAttribute('width'))  ? img.getAttribute('width')  : img.width;	imgTop  = img.offsetTop;	imgLeft = img.offsetLeft;	var detect = navigator.userAgent.toLowerCase();	var OS,browser,total,thestring;	var version = 0;	if (checkIt('konqueror')) {		browser = "Konqueror";		OS = "Linux";	}	else if (checkIt('omniweb')) browser = "OmniWeb";	else if (checkIt('webtv')) browser = "WebTV";	else if (checkIt('icab')) browser = "iCab";	else if (checkIt('opera')) browser = "Opera";	else if (checkIt('safari')) browser = "Safari";	else if (checkIt('firefox')) browser = "Firefox";	else if (checkIt('msie')) browser = "Internet Explorer";	else if (!checkIt('compatible')) {		browser = "Netscape Navigator";		version = detect.charAt(8);	}	else browser = "An unknown browser";	function checkIt(string) {		place = detect.indexOf(string) + 1;		thestring = string;		return place;	}	if (checkIt('msie')) {		c.style.height = (credit_height !=0) ? (imgHeight*credit_height)/100+1+'px' : imgHeight+'px';		c.style.width  = (credit_width  !=0) ? (imgWidth*credit_width)/100+1+'px'  : imgWidth+'px';		d.style.height = (credit_height !=0) ? (imgHeight*credit_height)/100+1+'px' : imgHeight+'px';		d.style.width  = (credit_width  !=0) ? (imgWidth*credit_width)/100+1+'px'  : imgWidth+'px';	}	else if (checkIt('safari')) {		c.style.height = (credit_height !=0) ? (imgHeight*credit_height)/100+14+'px' : imgHeight+'px';		c.style.width  = (credit_width  !=0) ? (imgWidth*credit_width)/100+8+'px'  : imgWidth+'px';		d.style.height = (credit_height !=0) ? (imgHeight*credit_height)/100+14+'px' : imgHeight+'px';		d.style.width  = (credit_width  !=0) ? (imgWidth*credit_width)/100+8+'px'  : imgWidth+'px';	}	else if (checkIt('firefox')) {		c.style.height = (credit_height !=0) ? (imgHeight*credit_height)/100+14+'px' : imgHeight+'px';		c.style.width  = (credit_width  !=0) ? (imgWidth*credit_width)/100+8+'px'  : imgWidth+'px';		d.style.height = (credit_height !=0) ? (imgHeight*credit_height)/100+14+'px' : imgHeight+'px';		d.style.width  = (credit_width  !=0) ? (imgWidth*credit_width)/100+8+'px'  : imgWidth+'px';	}	else {		c.style.height = (credit_height !=0) ? (imgHeight*credit_height)/100+14+'px' : imgHeight+'px';		c.style.width  = (credit_width  !=0) ? (imgWidth*credit_width)/100+10+'px'  : imgWidth+'px';		d.style.height = (credit_height !=0) ? (imgHeight*credit_height)/100+14+'px' : imgHeight+'px';		d.style.width  = (credit_width  !=0) ? (imgWidth*credit_width)/100+10+'px'  : imgWidth+'px';	}	c.style.top  = (credit_top  !=0)  ? (imgTop+(imgHeight/(100/credit_top)))+'px'  : imgTop+'px';	c.style.left = (credit_left !=0)  ? (imgLeft+(imgWidth/(100/credit_left)))+'px' : imgLeft+'px';	d.style.top  = (credit_top  !=0)  ? (imgTop+(imgHeight/(100/credit_top)))+'px'  : imgTop+'px';	d.style.right = (credit_left !=0)  ? (imgLeft+(imgWidth/(100/credit_left)))+'px' : imgLeft+'px';	c.style.display='block';	d.style.display='block';}