function setCompareTab(layerName){
	//hide all layers
	MM_showHideLayers('GeneralLayer','','hide');
	MM_showHideLayers('SpecsLayer','','hide');
	MM_showHideLayers('OptionsLayer','','hide');
	MM_showHideLayers('OtherLayer','','hide');
	//show selected layer
	MM_showHideLayers(layerName,'','show');
	
	//hide all tabs
	MM_swapImage('GeneralTab','','images/compare/tabs/GeneralOff.jpg');
	MM_swapImage('SpecsTrans','','images/compare/tabs/curveOff.jpg');
	MM_swapImage('SpecsTab','','images/compare/tabs/SpecsOff.jpg');
	MM_swapImage('OptionTrans','','images/compare/tabs/curveOff.jpg');
	MM_swapImage('OptionsTab','','images/compare/tabs/OptionsOff.jpg');
	MM_swapImage('OtherTrans','','images/compare/tabs/curveOff.jpg');
	MM_swapImage('OtherTab','','images/compare/tabs/OtherOff.jpg');
	
	//set selected tab
	if(layerName == 'GeneralLayer'){
		MM_swapImage('GeneralTab','','images/compare/tabs/GeneralOn.jpg');
		MM_swapImage('OptionTrans','','images/compare/tabs/CurveOn.jpg');
	}
	if(layerName == 'OptionsLayer'){
		MM_swapImage('OptionTrans','','images/compare/tabs/LeftOn.jpg');
		MM_swapImage('OptionsTab','','images/compare/tabs/OptionsOn.jpg');
		MM_swapImage('SpecsTrans','','images/compare/tabs/CurveOn.jpg');
	}
	if(layerName == 'SpecsLayer'){
		MM_swapImage('SpecsTrans','','images/compare/tabs/LeftOn.jpg');
		MM_swapImage('SpecsTab','','images/compare/tabs/SpecsOn.jpg');
		MM_swapImage('OtherTrans','','images/compare/tabs/CurveOn.jpg');
	}
	if(layerName == 'OtherLayer'){
		MM_swapImage('OtherTrans','','images/compare/tabs/LeftOn.jpg');
		MM_swapImage('OtherTab','','images/compare/tabs/OtherOn.jpg');
	}
	
}