function disableCtrlKeyCombination(e)
{
        //list all CTRL + key combinations you want to disable
        //var forbiddenKeys = new Array('a', 'n', 'c', 'x', 'v', 'j');
		
		var key;
        var isCtrl;

		var quote= new Array(6)
		quote[0]="a";
		quote[1]="n";
		quote[2]="c";
		quote[3]="x";
		quote[4]="v"; 
		quote[5]="j"; 

        if(window.event)
        {
                key = window.event.keyCode;     //IE
                if(window.event.ctrlKey)
                        isCtrl = true;
                else
                        isCtrl = false;
        }
        else
        {
                key = e.which;     //firefox
			    if(e.ctrlKey)
                        isCtrl = true;
                else
                        isCtrl = false;
        }

        //if ctrl is pressed check if other key is in forbidenKeys array
		
        if(isCtrl)
        {	
                for(i=0; i<quote.length; i++)
                {
                        //case-insensitive comparation
						//alert(i);
                        if(quote[i].toLowerCase() == String.fromCharCode(key).toLowerCase())
                        {			
                                alert('Key combination CTRL + ' + String.fromCharCode(key) +' has been disabled.');
                                return false;
                        }
                }
        }
        return true;
}