dear friend
got ur problem that is realy not so tipical ,just call the getProperty 
method at run time ,pass instance name of moive clip ,property to get and 
the save it in varriable like this
setvarriavle height=getProperty(instancename of movieclip,property to get
(like widht,height,xpos, ypos,etc...,)
this will save current height in varriable height ans then use the 
varriavle whereever u want
Your friend 
Rana Ahsan
Pakistan